<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.pentair.com/role/Acquisitions" xlink:href="pnr-20200630.xsd#Acquisitions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/AcquisitionsAcquisitionsDetails" xlink:href="pnr-20200630.xsd#AcquisitionsAcquisitionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/BasisOfPresentationAndResponsibilityForInterimFinancialStatements" xlink:href="pnr-20200630.xsd#BasisOfPresentationAndResponsibilityForInterimFinancialStatements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/BasisOfPresentationAndResponsibilityForInterimFinancialStatementsAdoptionOfNewAccountingStandardsDetails" xlink:href="pnr-20200630.xsd#BasisOfPresentationAndResponsibilityForInterimFinancialStatementsAdoptionOfNewAccountingStandardsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/BasisOfPresentationAndResponsibilityForInterimFinancialStatementsTables" xlink:href="pnr-20200630.xsd#BasisOfPresentationAndResponsibilityForInterimFinancialStatementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/BenefitPlans" xlink:href="pnr-20200630.xsd#BenefitPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/BenefitPlansDetail" xlink:href="pnr-20200630.xsd#BenefitPlansDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/BenefitPlansTables" xlink:href="pnr-20200630.xsd#BenefitPlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CommitmentsAndContingencies" xlink:href="pnr-20200630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CommitmentsAndContingenciesChangesInCarryingAmountOfServiceAndProductWarrantiesDetail" xlink:href="pnr-20200630.xsd#CommitmentsAndContingenciesChangesInCarryingAmountOfServiceAndProductWarrantiesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CommitmentsAndContingenciesTables" xlink:href="pnr-20200630.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CondensedConsolidatedBalanceSheets" xlink:href="pnr-20200630.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="pnr-20200630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="pnr-20200630.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CondensedConsolidatedStatementsOfChangesInEquity" xlink:href="pnr-20200630.xsd#CondensedConsolidatedStatementsOfChangesInEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:href="pnr-20200630.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/CoverPage" xlink:href="pnr-20200630.xsd#CoverPage" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/Debt" xlink:href="pnr-20200630.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DebtAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#DebtAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DebtDebtAndAverageInterestRatesOnDebtOutstandingDetail" xlink:href="pnr-20200630.xsd#DebtDebtAndAverageInterestRatesOnDebtOutstandingDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DebtDebtOutstandingMaturesOnCalendarYearBasisDetail" xlink:href="pnr-20200630.xsd#DebtDebtOutstandingMaturesOnCalendarYearBasisDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DebtTables" xlink:href="pnr-20200630.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DerivativesAndFinancialInstruments" xlink:href="pnr-20200630.xsd#DerivativesAndFinancialInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#DerivativesAndFinancialInstrumentsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueDetail" xlink:href="pnr-20200630.xsd#DerivativesAndFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsRecordedAmountsAndEstimatedFairValuesDetail" xlink:href="pnr-20200630.xsd#DerivativesAndFinancialInstrumentsRecordedAmountsAndEstimatedFairValuesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsTables" xlink:href="pnr-20200630.xsd#DerivativesAndFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/EarningsPerShare" xlink:href="pnr-20200630.xsd#EarningsPerShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/EarningsPerShareBasicAndDilutedEarningsPerShareDetail" xlink:href="pnr-20200630.xsd#EarningsPerShareBasicAndDilutedEarningsPerShareDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/EarningsPerShareTables" xlink:href="pnr-20200630.xsd#EarningsPerShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssets" xlink:href="pnr-20200630.xsd#GoodwillAndOtherIdentifiableIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#GoodwillAndOtherIdentifiableIntangibleAssetsAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsChangesInCarryingAmountOfGoodwillBySegmentDetail" xlink:href="pnr-20200630.xsd#GoodwillAndOtherIdentifiableIntangibleAssetsChangesInCarryingAmountOfGoodwillBySegmentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsDetailOfIdentifiableIntangibleAssetsDetail" xlink:href="pnr-20200630.xsd#GoodwillAndOtherIdentifiableIntangibleAssetsDetailOfIdentifiableIntangibleAssetsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsEstimatedFutureAmortizationExpenseForIdentifiableIntangibleAssetsDetail" xlink:href="pnr-20200630.xsd#GoodwillAndOtherIdentifiableIntangibleAssetsEstimatedFutureAmortizationExpenseForIdentifiableIntangibleAssetsDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsTables" xlink:href="pnr-20200630.xsd#GoodwillAndOtherIdentifiableIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/IncomeTaxes" xlink:href="pnr-20200630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/IncomeTaxesAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#IncomeTaxesAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/Restructuring" xlink:href="pnr-20200630.xsd#Restructuring" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RestructuringAccrualActivityDetail" xlink:href="pnr-20200630.xsd#RestructuringAccrualActivityDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RestructuringAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#RestructuringAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RestructuringCostsIncludedInSellingGeneralAdministrativeExpensesDetail" xlink:href="pnr-20200630.xsd#RestructuringCostsIncludedInSellingGeneralAdministrativeExpensesDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RestructuringRestructuringCostsBySegmentDetails" xlink:href="pnr-20200630.xsd#RestructuringRestructuringCostsBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RestructuringTables" xlink:href="pnr-20200630.xsd#RestructuringTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/Revenue" xlink:href="pnr-20200630.xsd#Revenue" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RevenueAdditionalInformationDetails" xlink:href="pnr-20200630.xsd#RevenueAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RevenueGeographicNetSalesInformationBySegmentDetails" xlink:href="pnr-20200630.xsd#RevenueGeographicNetSalesInformationBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RevenuePerformanceObligationsDetails" xlink:href="pnr-20200630.xsd#RevenuePerformanceObligationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RevenueScheduleOfContractAssetsAndLiabilitiesDetails" xlink:href="pnr-20200630.xsd#RevenueScheduleOfContractAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/RevenueTables" xlink:href="pnr-20200630.xsd#RevenueTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SegmentInformation" xlink:href="pnr-20200630.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SegmentInformationFinancialInformationByReportableSegmentDetail" xlink:href="pnr-20200630.xsd#SegmentInformationFinancialInformationByReportableSegmentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SegmentInformationReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedDetails" xlink:href="pnr-20200630.xsd#SegmentInformationReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SegmentInformationTables" xlink:href="pnr-20200630.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SharePlans" xlink:href="pnr-20200630.xsd#SharePlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SharePlansAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#SharePlansAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SharePlansScheduleOfShareBasedCompensationExpenseDetails" xlink:href="pnr-20200630.xsd#SharePlansScheduleOfShareBasedCompensationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SharePlansScheduleOfValuationAssumptionsDetails" xlink:href="pnr-20200630.xsd#SharePlansScheduleOfValuationAssumptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SharePlansTables" xlink:href="pnr-20200630.xsd#SharePlansTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/ShareholdersEquity" xlink:href="pnr-20200630.xsd#ShareholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/ShareholdersEquityAdditionalInformationDetail" xlink:href="pnr-20200630.xsd#ShareholdersEquityAdditionalInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SupplementalBalanceSheetInformation" xlink:href="pnr-20200630.xsd#SupplementalBalanceSheetInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SupplementalBalanceSheetInformationDetail" xlink:href="pnr-20200630.xsd#SupplementalBalanceSheetInformationDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.pentair.com/role/SupplementalBalanceSheetInformationTables" xlink:href="pnr-20200630.xsd#SupplementalBalanceSheetInformationTables" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/Acquisitions" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/AcquisitionsAcquisitionsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/BasisOfPresentationAndResponsibilityForInterimFinancialStatements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/BasisOfPresentationAndResponsibilityForInterimFinancialStatementsAdoptionOfNewAccountingStandardsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/BasisOfPresentationAndResponsibilityForInterimFinancialStatementsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/BenefitPlans" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/BenefitPlansDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_d77fe029-f23f-9e6c-6011-e5f759449bed" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_e14243b3-33a1-5459-a451-077ec8d3f8e3" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_d77fe029-f23f-9e6c-6011-e5f759449bed" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_e14243b3-33a1-5459-a451-077ec8d3f8e3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_08bfb8dd-9b96-b2df-e96d-3661802234df" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_d77fe029-f23f-9e6c-6011-e5f759449bed" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_08bfb8dd-9b96-b2df-e96d-3661802234df" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_65f7f8a8-89d5-6dc6-d223-452e554561e4" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_d77fe029-f23f-9e6c-6011-e5f759449bed" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_65f7f8a8-89d5-6dc6-d223-452e554561e4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_4622162a-b5c2-f496-071d-34ab05def244" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_d77fe029-f23f-9e6c-6011-e5f759449bed" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_4622162a-b5c2-f496-071d-34ab05def244" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/BenefitPlansTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CommitmentsAndContingenciesAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CommitmentsAndContingenciesChangesInCarryingAmountOfServiceAndProductWarrantiesDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:to="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_9c889623-7b4f-c89a-bbb3-2bc9fb9ad9f5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_AccountsPayableCurrent_9c889623-7b4f-c89a-bbb3-2bc9fb9ad9f5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_a2b836a7-cc87-0e4f-38a0-c91a29535622" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_a2b836a7-cc87-0e4f-38a0-c91a29535622" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_aa2e73c1-d03e-7f76-3502-7a650f99607c" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_aa2e73c1-d03e-7f76-3502-7a650f99607c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_540758d9-5c85-d758-1cf1-4856b8f457a3" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_540758d9-5c85-d758-1cf1-4856b8f457a3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_64993a75-9b0c-349a-1011-cc5a81c58412" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_64993a75-9b0c-349a-1011-cc5a81c58412" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValueOutstanding" xlink:label="loc_us-gaap_CommonStockValueOutstanding_294c6946-9048-096a-8276-56aec7d04572" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_CommonStockValueOutstanding_294c6946-9048-096a-8276-56aec7d04572" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_3d5a0ca6-0f59-67e6-adb5-6aecd22b693b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_AdditionalPaidInCapital_3d5a0ca6-0f59-67e6-adb5-6aecd22b693b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62305d8f-d807-0fe8-d0ab-f2c2b3d03011" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62305d8f-d807-0fe8-d0ab-f2c2b3d03011" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_988c1346-b444-a867-fe80-f3aec1443d54" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_988c1346-b444-a867-fe80-f3aec1443d54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1de780cc-9607-daa3-0bed-03c88ae94769" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1de780cc-9607-daa3-0bed-03c88ae94769" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsAndNotesReceivableNet" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_f6b97da2-ec05-1e8b-bd3a-dd6ae7a357aa" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_f6b97da2-ec05-1e8b-bd3a-dd6ae7a357aa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_cc720f44-4c90-5acc-2e7e-b88e80f2af28" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_InventoryNet_cc720f44-4c90-5acc-2e7e-b88e80f2af28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_37b440e2-656c-b624-0688-b7cf681bf981" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:to="loc_us-gaap_Goodwill_37b440e2-656c-b624-0688-b7cf681bf981" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_d9787bcc-e26a-e14e-b8ed-b82e68531cea" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_d9787bcc-e26a-e14e-b8ed-b82e68531cea" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_848cd271-4e03-8c13-d21d-e6ec9c3916f7" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_Depreciation_848cd271-4e03-8c13-d21d-e6ec9c3916f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentForAmortization" xlink:label="loc_us-gaap_AdjustmentForAmortization_de285b79-f632-6a58-7309-c47895796efb" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_AdjustmentForAmortization_de285b79-f632-6a58-7309-c47895796efb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_9a5dd9a5-8471-2942-da95-5c0a29bbe3b1" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_9a5dd9a5-8471-2942-da95-5c0a29bbe3b1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_2590fc0f-c2e5-fe6d-0763-c4943b1b3e60" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_2590fc0f-c2e5-fe6d-0763-c4943b1b3e60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_f0b9d825-b0b9-37fd-4d25-9294a8598890" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_ShareBasedCompensation_f0b9d825-b0b9-37fd-4d25-9294a8598890" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_b5495221-c933-5c88-514e-d2731414949c" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_AssetImpairmentCharges_b5495221-c933-5c88-514e-d2731414949c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_4622162a-b5c2-f496-071d-34ab05def244" xlink:type="locator" />
    <link:calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLossImmediateRecognitionAsComponentInNetPeriodicBenefitCostCredit_4622162a-b5c2-f496-071d-34ab05def244" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash_c52c87c0-47e1-9a76-3765-621be37e2286" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncash_c52c87c0-47e1-9a76-3765-621be37e2286" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09b7b41a-f5a1-c45e-d61b-846fff462802" xlink:type="locator" />
    <link:calculationArc order="12" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09b7b41a-f5a1-c45e-d61b-846fff462802" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_f2b34f8d-2445-12ee-2c68-fa0c5409d5e0" xlink:type="locator" />
    <link:calculationArc order="13" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_f2b34f8d-2445-12ee-2c68-fa0c5409d5e0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_1502a2ec-0413-ad9c-1a23-dcc1783eb2fa" xlink:type="locator" />
    <link:calculationArc order="14" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentAssets_1502a2ec-0413-ad9c-1a23-dcc1783eb2fa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_792166b2-b561-55ef-12fd-ca8b50f64a38" xlink:type="locator" />
    <link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_792166b2-b561-55ef-12fd-ca8b50f64a38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities_f02d48ce-29a2-1655-a601-93e2cddd9d3a" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities_f02d48ce-29a2-1655-a601-93e2cddd9d3a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherCurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_750558bf-4307-f68e-7149-c5c45a57cf21" xlink:type="locator" />
    <link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherCurrentLiabilities_750558bf-4307-f68e-7149-c5c45a57cf21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet_8c184d23-eb39-692f-2cce-c25f051f4673" xlink:type="locator" />
    <link:calculationArc order="18" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet_8c184d23-eb39-692f-2cce-c25f051f4673" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_e29cccf8-6a61-25e9-e8d3-3b5943366ab7" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_e29cccf8-6a61-25e9-e8d3-3b5943366ab7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0f8df60b-841f-6df5-83c3-e4049d366459" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0f8df60b-841f-6df5-83c3-e4049d366459" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_6d7a72cc-b15d-447c-3b26-c3564dc5b0b1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_6d7a72cc-b15d-447c-3b26-c3564dc5b0b1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates_4ffdcd3b-0e66-67a0-d428-71b5ab92a9bc" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates_4ffdcd3b-0e66-67a0-d428-71b5ab92a9bc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6abb14d9-7978-302d-af6b-dbfc88f76bf2" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6abb14d9-7978-302d-af6b-dbfc88f76bf2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_b5cf64b6-8899-5a9a-328a-4f0a312ae378" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_b5cf64b6-8899-5a9a-328a-4f0a312ae378" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_31025a66-07f0-e773-4462-872a46a21818" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfLinesOfCredit_31025a66-07f0-e773-4462-872a46a21818" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_f58bb86e-8b52-c30f-7b3a-554d3e73586f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_f58bb86e-8b52-c30f-7b3a-554d3e73586f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_d03b640f-8d2c-4108-a1c4-1354103a7ee2" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_d03b640f-8d2c-4108-a1c4-1354103a7ee2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_3b304564-1a0d-03c8-a331-770e72d1f6fc" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions_3b304564-1a0d-03c8-a331-770e72d1f6fc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_3f804297-91a1-3939-541d-a39b6288c9f9" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_3f804297-91a1-3939-541d-a39b6288c9f9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_41d72ed0-9a2b-31fb-9f8e-ad33f5eca26a" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_41d72ed0-9a2b-31fb-9f8e-ad33f5eca26a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_32f0c8eb-accb-9ab7-5d53-b9d2845af404" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_32f0c8eb-accb-9ab7-5d53-b9d2845af404" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/CondensedConsolidatedStatementsOfChangesInEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_a0c542a3-925c-dbca-caae-b45f1a51036d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_9296eff8-e0bf-16cc-fa86-f1b0968a0982" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_a0c542a3-925c-dbca-caae-b45f1a51036d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_9296eff8-e0bf-16cc-fa86-f1b0968a0982" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_676e5c7d-beab-c0d8-be00-bb5a9211e90b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_a0c542a3-925c-dbca-caae-b45f1a51036d" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_676e5c7d-beab-c0d8-be00-bb5a9211e90b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:to="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:to="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:to="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_3549c1c0-2f2a-e44b-026b-b4042153e489" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_3549c1c0-2f2a-e44b-026b-b4042153e489" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89fcc343-1933-1e77-588e-68d1c2f1a04f" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89fcc343-1933-1e77-588e-68d1c2f1a04f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_ef2ac9e8-006f-b467-3389-9a8ceec4bee5" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_ef2ac9e8-006f-b467-3389-9a8ceec4bee5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_2590fc0f-c2e5-fe6d-0763-c4943b1b3e60" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_2590fc0f-c2e5-fe6d-0763-c4943b1b3e60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_17d6fb00-d8ca-12a7-45aa-c9b702218c16" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_17d6fb00-d8ca-12a7-45aa-c9b702218c16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_7a3a9730-2927-590e-4e76-6aeb4157256e" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_7a3a9730-2927-590e-4e76-6aeb4157256e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax_bef197d0-a606-44b8-a66d-f55118c659d3" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax_bef197d0-a606-44b8-a66d-f55118c659d3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_68a2669c-01f8-c962-bf95-0b4231cd45da" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_68a2669c-01f8-c962-bf95-0b4231cd45da" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent_0814acd7-36c2-6bc4-5a36-ffae6a3c97e4" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent_0814acd7-36c2-6bc4-5a36-ffae6a3c97e4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_43102e24-b009-a823-41c0-3a851b53c822" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_b083e9ce-7a31-bc71-2302-34551814cc46" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasic_43102e24-b009-a823-41c0-3a851b53c822" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_b083e9ce-7a31-bc71-2302-34551814cc46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_144f1196-7804-6573-e88d-e1f54b569762" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasic_43102e24-b009-a823-41c0-3a851b53c822" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_144f1196-7804-6573-e88d-e1f54b569762" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/CoverPage" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/Debt" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/DebtAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/DebtDebtAndAverageInterestRatesOnDebtOutstandingDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/DebtDebtOutstandingMaturesOnCalendarYearBasisDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_5a8b47c3-ce9e-0992-6c29-f7284d4ea136" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_5a8b47c3-ce9e-0992-6c29-f7284d4ea136" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_ce3ac95b-761b-7fbc-3779-1bdfd056c71f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_ce3ac95b-761b-7fbc-3779-1bdfd056c71f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_d39bb101-f79f-a162-9929-01083e9d64b5" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_d39bb101-f79f-a162-9929-01083e9d64b5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_73238937-86a2-9126-69f0-c70629155ebe" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_73238937-86a2-9126-69f0-c70629155ebe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_a170264f-50ba-a4bb-6d22-ec86b5249633" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_a170264f-50ba-a4bb-6d22-ec86b5249633" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_da82f4c2-6e6f-ccde-a6bf-f559322a3267" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_da82f4c2-6e6f-ccde-a6bf-f559322a3267" xlink:type="arc" />
    <link:loc xlink:href="pnr-20200630.xsd#pnr_LongtermDebtMaturitiesRepaymentsofPrincipalinYearSix" xlink:label="loc_pnr_LongtermDebtMaturitiesRepaymentsofPrincipalinYearSix_ABA1855C09E91124D3EFC69BE890BCF5" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_pnr_LongtermDebtMaturitiesRepaymentsofPrincipalinYearSix_ABA1855C09E91124D3EFC69BE890BCF5" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/DebtTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/DerivativesAndFinancialInstruments" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9f436187-314b-180b-a248-fa52bbc667f6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_4192f196-07b4-1714-355f-21e29c89b432" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9f436187-314b-180b-a248-fa52bbc667f6" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_4192f196-07b4-1714-355f-21e29c89b432" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_103b152e-0ae8-d915-6e3d-c66b85fd9d6e" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9f436187-314b-180b-a248-fa52bbc667f6" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_103b152e-0ae8-d915-6e3d-c66b85fd9d6e" xlink:type="arc" />
    <link:loc xlink:href="pnr-20200630.xsd#pnr_DeferredCompensationPlanAssetsFairValueDisclosure" xlink:label="loc_pnr_DeferredCompensationPlanAssetsFairValueDisclosure_545d445e-dd54-dce6-1871-d7c914bb45a6" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_9f436187-314b-180b-a248-fa52bbc667f6" xlink:to="loc_pnr_DeferredCompensationPlanAssetsFairValueDisclosure_545d445e-dd54-dce6-1871-d7c914bb45a6" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsRecordedAmountsAndEstimatedFairValuesDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtPercentageBearingVariableInterestAmount" xlink:label="loc_us-gaap_LongtermDebtPercentageBearingVariableInterestAmount_98625943-66da-d00d-4480-1d87c87a3455" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongtermDebtPercentageBearingVariableInterestAmount_98625943-66da-d00d-4480-1d87c87a3455" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongtermDebtPercentageBearingFixedInterestAmount" xlink:label="loc_us-gaap_LongtermDebtPercentageBearingFixedInterestAmount_0a167140-e581-4131-762a-6b1a2ac94ed9" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a2f199ce-3001-c200-d488-633bc54206dc" xlink:to="loc_us-gaap_LongtermDebtPercentageBearingFixedInterestAmount_0a167140-e581-4131-762a-6b1a2ac94ed9" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/DerivativesAndFinancialInstrumentsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/EarningsPerShare" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/EarningsPerShareBasicAndDilutedEarningsPerShareDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8c9389ea-1fbb-7e45-ce1f-5a1d89572c0d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_fbdbb03d-8583-701f-d6e2-69f8229c6051" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8c9389ea-1fbb-7e45-ce1f-5a1d89572c0d" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_fbdbb03d-8583-701f-d6e2-69f8229c6051" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_90854703-859b-2c45-aef2-d270627b3141" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8c9389ea-1fbb-7e45-ce1f-5a1d89572c0d" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_90854703-859b-2c45-aef2-d270627b3141" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/EarningsPerShareTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssets" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsChangesInCarryingAmountOfGoodwillBySegmentDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsDetailOfIdentifiableIntangibleAssetsDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_a32ca153-2a77-c1bc-f506-c7b61720c625" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_a32ca153-2a77-c1bc-f506-c7b61720c625" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_65140cb5-12a8-2030-97e2-fa6daceadf40" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_65140cb5-12a8-2030-97e2-fa6daceadf40" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsEstimatedFutureAmortizationExpenseForIdentifiableIntangibleAssetsDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/GoodwillAndOtherIdentifiableIntangibleAssetsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/Restructuring" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RestructuringAccrualActivityDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RestructuringAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RestructuringCostsIncludedInSellingGeneralAdministrativeExpensesDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RestructuringRestructuringCostsBySegmentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RestructuringTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/Revenue" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RevenueAdditionalInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RevenueGeographicNetSalesInformationBySegmentDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RevenuePerformanceObligationsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/RevenueScheduleOfContractAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="pnr-20200630.xsd#pnr_ContractWithCustomerAssetLiabilityNet" xlink:label="loc_pnr_ContractWithCustomerAssetLiabilityNet_3d534bad-3bb3-b80a-de0a-d7c914411da1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_fcc3b672-6260-acd3-7f04-cb65043e671c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pnr_ContractWithCustomerAssetLiabilityNet_3d534bad-3bb3-b80a-de0a-d7c914411da1" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_fcc3b672-6260-acd3-7f04-cb65043e671c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_dd2c0b6c-bd52-a4d4-2c85-63d78ccca807" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_pnr_ContractWithCustomerAssetLiabilityNet_3d534bad-3bb3-b80a-de0a-d7c914411da1" xlink:to="loc_us-gaap_ContractWithCustomerLiability_dd2c0b6c-bd52-a4d4-2c85-63d78ccca807" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/RevenueTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SegmentInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SegmentInformationFinancialInformationByReportableSegmentDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SegmentInformationReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SharePlans" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SharePlansAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SharePlansScheduleOfShareBasedCompensationExpenseDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SharePlansScheduleOfValuationAssumptionsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SharePlansTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/ShareholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/ShareholdersEquityAdditionalInformationDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SupplementalBalanceSheetInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.pentair.com/role/SupplementalBalanceSheetInformationDetail" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DividendsPayableCurrent" xlink:label="loc_us-gaap_DividendsPayableCurrent_0fa83cdd-5834-2522-0bdf-478d9b332d1d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_DividendsPayableCurrent_0fa83cdd-5834-2522-0bdf-478d9b332d1d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProductWarrantyAccrualClassifiedCurrent" xlink:label="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_e2904fee-b4e0-e40a-5e9a-b447875840f0" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_ProductWarrantyAccrualClassifiedCurrent_e2904fee-b4e0-e40a-5e9a-b447875840f0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedExchangeFeeRebateCurrentAndNoncurrent" xlink:label="loc_us-gaap_AccruedExchangeFeeRebateCurrentAndNoncurrent_1f337f0d-aea3-b723-2219-05747a1a000d" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_AccruedExchangeFeeRebateCurrentAndNoncurrent_1f337f0d-aea3-b723-2219-05747a1a000d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_68a2ece1-b79e-558c-a305-f3ccae8c21c3" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_68a2ece1-b79e-558c-a305-f3ccae8c21c3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_b91d2f01-85c2-f9fb-3250-26a4b1b39c5e" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_b91d2f01-85c2-f9fb-3250-26a4b1b39c5e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_2b7c899c-68f1-3819-df65-23c87d9e41df" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_2b7c899c-68f1-3819-df65-23c87d9e41df" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_ebb4c1f8-b5df-aab0-ee90-1e91fd21cf92" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_ebb4c1f8-b5df-aab0-ee90-1e91fd21cf92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_3663f62a-d853-209c-a92d-fd48eb5b23f4" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_fa7787c9-a33c-d084-bb97-5e2455f77a4c" xlink:to="loc_us-gaap_RestructuringReserve_3663f62a-d853-209c-a92d-fd48eb5b23f4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LandAndLandImprovements" xlink:label="loc_us-gaap_LandAndLandImprovements_7c1e1eb6-da05-83ac-06f5-e7d7fc2e5691" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:to="loc_us-gaap_LandAndLandImprovements_7c1e1eb6-da05-83ac-06f5-e7d7fc2e5691" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BuildingsAndImprovementsGross" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_f1ca2698-ef44-aef0-3195-46d5b5f09667" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:to="loc_us-gaap_BuildingsAndImprovementsGross_f1ca2698-ef44-aef0-3195-46d5b5f09667" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MachineryAndEquipmentGross" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_4f9f456f-b99f-98cb-4c0d-8686ab07bcd2" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:to="loc_us-gaap_MachineryAndEquipmentGross_4f9f456f-b99f-98cb-4c0d-8686ab07bcd2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareGross" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_5c208d3b-f56b-068e-b2b4-78df423e56a3" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_5c208d3b-f56b-068e-b2b4-78df423e56a3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionInProgressGross" xlink:label="loc_us-gaap_ConstructionInProgressGross_849c20f4-7842-f86b-ff81-0b112bbf996c" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_94cd7971-9d17-1c6e-6642-d4d38fb682b6" xlink:to="loc_us-gaap_ConstructionInProgressGross_849c20f4-7842-f86b-ff81-0b112bbf996c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_7b7a3a8d-eb3d-0c85-68cc-b3d4d184ff23" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_7b7a3a8d-eb3d-0c85-68cc-b3d4d184ff23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_dcf3df0d-2155-35f6-715d-83a9bc9cf3fb" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_dcf3df0d-2155-35f6-715d-83a9bc9cf3fb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_60654fa3-82c2-3e38-ce88-436acda713ac" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_60654fa3-82c2-3e38-ce88-436acda713ac" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationPlanAssets" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_9463869c-b131-d718-a327-5cab3d8f4a68" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_9463869c-b131-d718-a327-5cab3d8f4a68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_4192f196-07b4-1714-355f-21e29c89b432" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_4192f196-07b4-1714-355f-21e29c89b432" xlink:type="arc" />
    <link:loc xlink:href="pnr-20200630.xsd#pnr_OtherLongTermAssets" xlink:label="loc_pnr_OtherLongTermAssets_e2b9d530-db13-5968-2260-d7c9145e78e1" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_f5af194e-2f7a-7374-84de-5cfd2f7198c9" xlink:to="loc_pnr_OtherLongTermAssets_e2b9d530-db13-5968-2260-d7c9145e78e1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d18f979c-644d-9e92-9e89-21cfd1312948" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d18f979c-644d-9e92-9e89-21cfd1312948" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_8d6007a8-8f31-8076-aac9-5a15220d4487" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_8d6007a8-8f31-8076-aac9-5a15220d4487" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SelfInsuranceReserveNoncurrent" xlink:label="loc_us-gaap_SelfInsuranceReserveNoncurrent_71124e9b-5be9-f802-adab-7adeed297444" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:to="loc_us-gaap_SelfInsuranceReserveNoncurrent_71124e9b-5be9-f802-adab-7adeed297444" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationLiabilityCurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrent_8dbb5d0a-e9b5-303d-049f-fe310cfd8b59" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrent_8dbb5d0a-e9b5-303d-049f-fe310cfd8b59" xlink:type="arc" />
    <link:loc xlink:href="pnr-20200630.xsd#pnr_OtherLongTermLiabilities" xlink:label="loc_pnr_OtherLongTermLiabilities_126f1eb9-b48e-ce42-ed4f-d7c91429d92f" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:to="loc_pnr_OtherLongTermLiabilities_126f1eb9-b48e-ce42-ed4f-d7c91429d92f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_103b152e-0ae8-d915-6e3d-c66b85fd9d6e" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_103b152e-0ae8-d915-6e3d-c66b85fd9d6e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_cc720f44-4c90-5acc-2e7e-b88e80f2af28" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryRawMaterialsAndSupplies" xlink:label="loc_us-gaap_InventoryRawMaterialsAndSupplies_cf6e76a2-6a1c-7043-0e35-c206ef3cfd02" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_cc720f44-4c90-5acc-2e7e-b88e80f2af28" xlink:to="loc_us-gaap_InventoryRawMaterialsAndSupplies_cf6e76a2-6a1c-7043-0e35-c206ef3cfd02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryWorkInProcess" xlink:label="loc_us-gaap_InventoryWorkInProcess_02c38264-930d-9c2f-e0a7-6a0838599d0b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_cc720f44-4c90-5acc-2e7e-b88e80f2af28" xlink:to="loc_us-gaap_InventoryWorkInProcess_02c38264-930d-9c2f-e0a7-6a0838599d0b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_4b469d73-0d86-8f9c-e98a-661ef709c068" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_cc720f44-4c90-5acc-2e7e-b88e80f2af28" xlink:to="loc_us-gaap_InventoryFinishedGoods_4b469d73-0d86-8f9c-e98a-661ef709c068" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_f68f267d-78ad-b62f-6b0e-44daadd4feda" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_f68f267d-78ad-b62f-6b0e-44daadd4feda" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidTaxes" xlink:label="loc_us-gaap_PrepaidTaxes_b440a9f7-3d5a-6822-147c-8733078e4b39" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:to="loc_us-gaap_PrepaidTaxes_b440a9f7-3d5a-6822-147c-8733078e4b39" xlink:type="arc" />
    <link:loc xlink:href="pnr-20200630.xsd#pnr_OtherCurrentAssets" xlink:label="loc_pnr_OtherCurrentAssets_716730fb-37c1-1b76-d8ef-d7c91467c738" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:to="loc_pnr_OtherCurrentAssets_716730fb-37c1-1b76-d8ef-d7c91467c738" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_fcc3b672-6260-acd3-7f04-cb65043e671c" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_fcc3b672-6260-acd3-7f04-cb65043e671c" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.pentair.com/role/SupplementalBalanceSheetInformationTables" xlink:type="extended" />
</link:linkbase>
