<?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.westlake.com/role/AccountsReceivableThirdParties" xlink:href="wlkp-20200930.xsd#AccountsReceivableThirdParties" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsReceivableThirdPartiesAccountsReceivablethirdPartiesScheduleOfAccountsReceivableDetails" xlink:href="wlkp-20200930.xsd#AccountsReceivableThirdPartiesAccountsReceivablethirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsReceivableThirdPartiesTables" xlink:href="wlkp-20200930.xsd#AccountsReceivableThirdPartiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/CommitmentsAndContingencies" xlink:href="wlkp-20200930.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedBalanceSheets" xlink:href="wlkp-20200930.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="wlkp-20200930.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="wlkp-20200930.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsOfChangesInEquity" xlink:href="wlkp-20200930.xsd#ConsolidatedStatementsOfChangesInEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsOfOperations" xlink:href="wlkp-20200930.xsd#ConsolidatedStatementsOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DeferredChargesAndOtherAssets" xlink:href="wlkp-20200930.xsd#DeferredChargesAndOtherAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DeferredChargesAndOtherAssetsDetails" xlink:href="wlkp-20200930.xsd#DeferredChargesAndOtherAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DerivativeCommodityInstrumentsDerivativeCommodityInstruments" xlink:href="wlkp-20200930.xsd#DerivativeCommodityInstrumentsDerivativeCommodityInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DerivativeCommodityInstrumentsDetails" xlink:href="wlkp-20200930.xsd#DerivativeCommodityInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DescriptionOfBusinessAndBasisOfPresentation" xlink:href="wlkp-20200930.xsd#DescriptionOfBusinessAndBasisOfPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DescriptionOfBusinessAndBasisOfPresentationDetails" xlink:href="wlkp-20200930.xsd#DescriptionOfBusinessAndBasisOfPresentationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DescriptionOfBusinessAndBasisOfPresentationPolicies" xlink:href="wlkp-20200930.xsd#DescriptionOfBusinessAndBasisOfPresentationPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnit" xlink:href="wlkp-20200930.xsd#DistributionsAndNetIncomePerLimitedPartnerUnit" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitBasicAndDilutedIncomePerLimitedPartnerUnitDetails" xlink:href="wlkp-20200930.xsd#DistributionsAndNetIncomePerLimitedPartnerUnitBasicAndDilutedIncomePerLimitedPartnerUnitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitDistributionPerCommonUnitDetails" xlink:href="wlkp-20200930.xsd#DistributionsAndNetIncomePerLimitedPartnerUnitDistributionPerCommonUnitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitDistributionsDeclaredDetails" xlink:href="wlkp-20200930.xsd#DistributionsAndNetIncomePerLimitedPartnerUnitDistributionsDeclaredDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitIncomeInExcessOfDistributionDetails" xlink:href="wlkp-20200930.xsd#DistributionsAndNetIncomePerLimitedPartnerUnitIncomeInExcessOfDistributionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitTables" xlink:href="wlkp-20200930.xsd#DistributionsAndNetIncomePerLimitedPartnerUnitTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/DocumentAndEntityInformation" xlink:href="wlkp-20200930.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/FairValueMeasurements" xlink:href="wlkp-20200930.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/FairValueMeasurementsSummaryOfCarryingAndFairValuesOfLongTermDebtDetails" xlink:href="wlkp-20200930.xsd#FairValueMeasurementsSummaryOfCarryingAndFairValuesOfLongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/FairValueMeasurementsTables" xlink:href="wlkp-20200930.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/Inventories" xlink:href="wlkp-20200930.xsd#Inventories" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/InventoriesDetails" xlink:href="wlkp-20200930.xsd#InventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/InventoriesTables" xlink:href="wlkp-20200930.xsd#InventoriesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/LongTermDebtPayableToWestlake" xlink:href="wlkp-20200930.xsd#LongTermDebtPayableToWestlake" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/LongTermDebtPayableToWestlakeDetails" xlink:href="wlkp-20200930.xsd#LongTermDebtPayableToWestlakeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/LongTermDebtPayableToWestlakeTables" xlink:href="wlkp-20200930.xsd#LongTermDebtPayableToWestlakeTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/PartnersEquity" xlink:href="wlkp-20200930.xsd#PartnersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/PartnersEquityDetails" xlink:href="wlkp-20200930.xsd#PartnersEquityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/PropertyPlantAndEquipment" xlink:href="wlkp-20200930.xsd#PropertyPlantAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/PropertyPlantAndEquipmentDetail" xlink:href="wlkp-20200930.xsd#PropertyPlantAndEquipmentDetail" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactions" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsAccountsReceivableFromAndAccountsPayableToRelatedPartiesDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsAccountsReceivableFromAndAccountsPayableToRelatedPartiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsCostOfSalesFromRelatedPartiesDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsCostOfSalesFromRelatedPartiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsDebtPayableToRelatedPartiesDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsDebtPayableToRelatedPartiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsGeneralDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsGeneralDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsGoodsAndServicesPurchasedFromWestlakeAndCapitalizedAsAssetsDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsGoodsAndServicesPurchasedFromWestlakeAndCapitalizedAsAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsMajorCustomerAndConcentrationRiskDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsMajorCustomerAndConcentrationRiskDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsSalesToRelatedPartiesDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsSalesToRelatedPartiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsServicesFromRelatedPartiesIncludedInSgaExpensesDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsServicesFromRelatedPartiesIncludedInSgaExpensesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsSiteLeaseAgreementsDetails" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsSiteLeaseAgreementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/RelatedPartyTransactionsTables" xlink:href="wlkp-20200930.xsd#RelatedPartyTransactionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/SupplementalInformation" xlink:href="wlkp-20200930.xsd#SupplementalInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.westlake.com/role/SupplementalInformationDetails" xlink:href="wlkp-20200930.xsd#SupplementalInformationDetails" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableThirdParties" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableThirdPartiesAccountsReceivablethirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_02eb9f27-cc70-d84a-60be-0ebfa9ad27e5" xlink:type="locator" />
    <link:loc xlink:href="wlkp-20200930.xsd#wlkp_TradeCustomerReceivableNetCurrent" xlink:label="loc_wlkp_TradeCustomerReceivableNetCurrent_7dd303df-2794-4835-b9e8-2039361dbee6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_02eb9f27-cc70-d84a-60be-0ebfa9ad27e5" xlink:to="loc_wlkp_TradeCustomerReceivableNetCurrent_7dd303df-2794-4835-b9e8-2039361dbee6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_19f07b48-bffc-70a8-4243-4777de5be6e5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_TradeCustomerReceivableNetCurrent_7dd303df-2794-4835-b9e8-2039361dbee6" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_19f07b48-bffc-70a8-4243-4777de5be6e5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_0c8253cd-fd72-2d52-2e6a-a3d95ccddddf" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_TradeCustomerReceivableNetCurrent_7dd303df-2794-4835-b9e8-2039361dbee6" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_0c8253cd-fd72-2d52-2e6a-a3d95ccddddf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherReceivablesNetCurrent" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_2248a5f6-a67e-f8c9-3870-0d0db6402cb8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_02eb9f27-cc70-d84a-60be-0ebfa9ad27e5" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_2248a5f6-a67e-f8c9-3870-0d0db6402cb8" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableThirdPartiesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_ae7d1998-6654-2677-8e9f-f36b62210000" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_a0e4a1b3-b018-392a-9b7d-09729b37d6a1" 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_ae7d1998-6654-2677-8e9f-f36b62210000" xlink:to="loc_us-gaap_Liabilities_a0e4a1b3-b018-392a-9b7d-09729b37d6a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_723c74a6-b3c0-ab21-b11a-8bd4ce4806f0" 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_a0e4a1b3-b018-392a-9b7d-09729b37d6a1" xlink:to="loc_us-gaap_LiabilitiesCurrent_723c74a6-b3c0-ab21-b11a-8bd4ce4806f0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_95fe5c6d-e90e-6d2c-8e9a-8339666be1b8" 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_723c74a6-b3c0-ab21-b11a-8bd4ce4806f0" xlink:to="loc_us-gaap_AccountsPayableCurrent_95fe5c6d-e90e-6d2c-8e9a-8339666be1b8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_4deaf78d-f730-176a-d6c6-47d6fc92ced8" 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_723c74a6-b3c0-ab21-b11a-8bd4ce4806f0" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_4deaf78d-f730-176a-d6c6-47d6fc92ced8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_c144e519-a387-57c4-b7d5-e286f563f1bd" 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_723c74a6-b3c0-ab21-b11a-8bd4ce4806f0" xlink:to="loc_us-gaap_AccountsPayableRelatedPartiesCurrent_c144e519-a387-57c4-b7d5-e286f563f1bd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_e498812a-ea06-2933-72f6-8e959ed1c719" 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_a0e4a1b3-b018-392a-9b7d-09729b37d6a1" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_e498812a-ea06-2933-72f6-8e959ed1c719" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_44e41183-ff71-8a5d-6bae-236dd27ab6c0" 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_a0e4a1b3-b018-392a-9b7d-09729b37d6a1" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_44e41183-ff71-8a5d-6bae-236dd27ab6c0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DueToRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesNoncurrent_ceca53b7-47ff-b5a0-4ea2-ff27e4a31caf" 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_a0e4a1b3-b018-392a-9b7d-09729b37d6a1" xlink:to="loc_us-gaap_DueToRelatedPartiesNoncurrent_ceca53b7-47ff-b5a0-4ea2-ff27e4a31caf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_c8c1ef7d-82ef-ec40-66d0-45806fc53a6e" 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_ae7d1998-6654-2677-8e9f-f36b62210000" xlink:to="loc_us-gaap_CommitmentsAndContingencies_c8c1ef7d-82ef-ec40-66d0-45806fc53a6e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bacf7390-2efd-38c7-9adb-089da890b645" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_ae7d1998-6654-2677-8e9f-f36b62210000" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bacf7390-2efd-38c7-9adb-089da890b645" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PartnersCapital" xlink:label="loc_us-gaap_PartnersCapital_1d6f2534-69c4-e1f6-a322-60bbee9efea7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bacf7390-2efd-38c7-9adb-089da890b645" xlink:to="loc_us-gaap_PartnersCapital_1d6f2534-69c4-e1f6-a322-60bbee9efea7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LimitedPartnersCapitalAccount" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_3c428bd4-2932-6f1f-ed59-2ce82506a328" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_1d6f2534-69c4-e1f6-a322-60bbee9efea7" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_3c428bd4-2932-6f1f-ed59-2ce82506a328" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GeneralPartnersCapitalAccount" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount_8f46742f-7316-846a-203d-c9783620843e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_1d6f2534-69c4-e1f6-a322-60bbee9efea7" xlink:to="loc_us-gaap_GeneralPartnersCapitalAccount_8f46742f-7316-846a-203d-c9783620843e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterestInLimitedPartnerships" xlink:label="loc_us-gaap_MinorityInterestInLimitedPartnerships_20af8072-b790-904e-4b0a-97e63e2d5253" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bacf7390-2efd-38c7-9adb-089da890b645" xlink:to="loc_us-gaap_MinorityInterestInLimitedPartnerships_20af8072-b790-904e-4b0a-97e63e2d5253" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_d88b9019-0bd3-d7de-96eb-5cd69c504c2c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_bceb5e86-dcaf-e940-c004-d20dda9b81f2" 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_d88b9019-0bd3-d7de-96eb-5cd69c504c2c" xlink:to="loc_us-gaap_AssetsCurrent_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_26247a2d-7bac-8834-3dc5-06c993b10b2c" 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_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_26247a2d-7bac-8834-3dc5-06c993b10b2c" xlink:type="arc" />
    <link:loc xlink:href="wlkp-20200930.xsd#wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent" xlink:label="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_a838c8f3-5d98-69a0-01be-2039365da157" 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_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:to="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_a838c8f3-5d98-69a0-01be-2039365da157" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableRelatedPartiesCurrent" xlink:label="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_ed718549-1cfe-f993-f4cb-ef808ccb9104" 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_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:to="loc_us-gaap_AccountsReceivableRelatedPartiesCurrent_ed718549-1cfe-f993-f4cb-ef808ccb9104" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_2107189c-f25f-5667-a3b4-dbf4394a5e32" 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_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_2107189c-f25f-5667-a3b4-dbf4394a5e32" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_aa7cc103-d668-cf3b-6875-81c99ffeac19" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:to="loc_us-gaap_InventoryNet_aa7cc103-d668-cf3b-6875-81c99ffeac19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_33b4d214-779b-2177-f7ba-19f0abb03b76" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_bceb5e86-dcaf-e940-c004-d20dda9b81f2" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_33b4d214-779b-2177-f7ba-19f0abb03b76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_bf545d72-755b-f46c-4176-2eeaac0328d1" 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_d88b9019-0bd3-d7de-96eb-5cd69c504c2c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_bf545d72-755b-f46c-4176-2eeaac0328d1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_57088d99-3f43-6bbf-c330-0bf0e1b35b0b" 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_d88b9019-0bd3-d7de-96eb-5cd69c504c2c" xlink:to="loc_us-gaap_Goodwill_57088d99-3f43-6bbf-c330-0bf0e1b35b0b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredCostsAndOtherAssets" xlink:label="loc_us-gaap_DeferredCostsAndOtherAssets_fba27905-39d6-9fcf-dc5b-ae1851f7b43c" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_d88b9019-0bd3-d7de-96eb-5cd69c504c2c" xlink:to="loc_us-gaap_DeferredCostsAndOtherAssets_fba27905-39d6-9fcf-dc5b-ae1851f7b43c" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_7e98a0be-51ae-18d0-54bf-b32eca8c5c1d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" 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_7e98a0be-51ae-18d0-54bf-b32eca8c5c1d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_82a1dba8-8b5a-130a-edce-afbb0d3a199c" 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_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_ProfitLoss_82a1dba8-8b5a-130a-edce-afbb0d3a199c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_fb4a1534-3ea3-3150-f601-42486b71bc63" 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_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_fb4a1534-3ea3-3150-f601-42486b71bc63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_2e1496ac-149c-0be7-633a-66d361065320" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_2e1496ac-149c-0be7-633a-66d361065320" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_f67f6914-036e-0eab-324c-789ab090d91c" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_f67f6914-036e-0eab-324c-789ab090d91c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_660d037d-5031-2fde-c0d3-d2b6978292ac" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_660d037d-5031-2fde-c0d3-d2b6978292ac" xlink:type="arc" />
    <link:loc xlink:href="wlkp-20200930.xsd#wlkp_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets" xlink:label="loc_wlkp_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets_485242c8-f8e0-718e-e8f9-2039366da837" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_wlkp_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets_485242c8-f8e0-718e-e8f9-2039366da837" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_1aefa3b7-6b7a-d481-5bdc-6b8b587c627e" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_1aefa3b7-6b7a-d481-5bdc-6b8b587c627e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_4b0bcec4-8cac-770b-1104-d9ba7647c257" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_4b0bcec4-8cac-770b-1104-d9ba7647c257" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_4392a9aa-12d6-0a02-3bb4-a001e4753188" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_4392a9aa-12d6-0a02-3bb4-a001e4753188" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_4bf22407-489a-db73-9376-d35874de9524" xlink:type="locator" />
    <link:calculationArc order="10" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_4bf22407-489a-db73-9376-d35874de9524" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_0f2b9828-5f8e-5896-c7bd-f8b6ab4926af" xlink:type="locator" />
    <link:calculationArc order="11" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_13d5d34e-e391-ca89-d84d-71b1e1c2a78c" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_0f2b9828-5f8e-5896-c7bd-f8b6ab4926af" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2794b8a8-762d-d243-a2f5-a00d52d74432" 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_7e98a0be-51ae-18d0-54bf-b32eca8c5c1d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_2794b8a8-762d-d243-a2f5-a00d52d74432" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ca48a49a-2cde-cf3d-6904-e8f08b6e1fbb" 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_2794b8a8-762d-d243-a2f5-a00d52d74432" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_ca48a49a-2cde-cf3d-6904-e8f08b6e1fbb" xlink:type="arc" />
    <link:loc xlink:href="wlkp-20200930.xsd#wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement" xlink:label="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_c9a8af0f-b551-1dd4-fb97-203936ab960a" 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_2794b8a8-762d-d243-a2f5-a00d52d74432" xlink:to="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_c9a8af0f-b551-1dd4-fb97-203936ab960a" xlink:type="arc" />
    <link:loc xlink:href="wlkp-20200930.xsd#wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement" xlink:label="loc_wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement_3252462f-ac15-460c-3e08-2039369c0684" 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_2794b8a8-762d-d243-a2f5-a00d52d74432" xlink:to="loc_wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement_3252462f-ac15-460c-3e08-2039369c0684" xlink:type="arc" />
    <link:loc xlink:href="wlkp-20200930.xsd#wlkp_CashProvidedbyUsedinInvestingActivitiesOther" xlink:label="loc_wlkp_CashProvidedbyUsedinInvestingActivitiesOther_fea358e6-2fde-f7cf-2f52-2039365cbabf" 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_2794b8a8-762d-d243-a2f5-a00d52d74432" xlink:to="loc_wlkp_CashProvidedbyUsedinInvestingActivitiesOther_fea358e6-2fde-f7cf-2f52-2039365cbabf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" 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_7e98a0be-51ae-18d0-54bf-b32eca8c5c1d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromRelatedPartyDebt" xlink:label="loc_us-gaap_ProceedsFromRelatedPartyDebt_895c93f7-a46a-3e59-5f17-17737f376d0a" 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_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" xlink:to="loc_us-gaap_ProceedsFromRelatedPartyDebt_895c93f7-a46a-3e59-5f17-17737f376d0a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_603d7397-2301-aaff-74ee-c47629e5717e" 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_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_603d7397-2301-aaff-74ee-c47629e5717e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_3ca2c87f-316b-e220-7304-4292a9afb501" 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_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_3ca2c87f-316b-e220-7304-4292a9afb501" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_470454d8-3446-2b1d-86bf-b1a2339c1805" 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_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_470454d8-3446-2b1d-86bf-b1a2339c1805" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfRelatedPartyDebt" xlink:label="loc_us-gaap_RepaymentsOfRelatedPartyDebt_c08fcec1-e4b8-2efe-3da5-bd945cf06317" 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_0a7e00ec-a1a5-81e8-5255-8844ac6fe87f" xlink:to="loc_us-gaap_RepaymentsOfRelatedPartyDebt_c08fcec1-e4b8-2efe-3da5-bd945cf06317" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsOfChangesInEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_aaf4fade-f652-62f8-cf02-c59447905641" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_82a1dba8-8b5a-130a-edce-afbb0d3a199c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_aaf4fade-f652-62f8-cf02-c59447905641" xlink:to="loc_us-gaap_ProfitLoss_82a1dba8-8b5a-130a-edce-afbb0d3a199c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_326571dd-2089-b65a-821d-3163d8518a05" 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_82a1dba8-8b5a-130a-edce-afbb0d3a199c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_326571dd-2089-b65a-821d-3163d8518a05" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_86cfb7da-c050-ac7c-919e-7f811affb4ae" 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_326571dd-2089-b65a-821d-3163d8518a05" xlink:to="loc_us-gaap_OperatingIncomeLoss_86cfb7da-c050-ac7c-919e-7f811affb4ae" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_da1a9111-3960-6334-38ac-32be56368293" 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_86cfb7da-c050-ac7c-919e-7f811affb4ae" xlink:to="loc_us-gaap_GrossProfit_da1a9111-3960-6334-38ac-32be56368293" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_01f4f849-ade5-f04f-1204-64d74a0c2886" 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_da1a9111-3960-6334-38ac-32be56368293" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_01f4f849-ade5-f04f-1204-64d74a0c2886" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_0bbe8f4f-d085-9302-fa93-9512411ebfc0" 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_da1a9111-3960-6334-38ac-32be56368293" xlink:to="loc_us-gaap_Revenues_0bbe8f4f-d085-9302-fa93-9512411ebfc0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89404ae6-0808-876c-4ac7-0c429ea9ed38" 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_86cfb7da-c050-ac7c-919e-7f811affb4ae" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89404ae6-0808-876c-4ac7-0c429ea9ed38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseRelatedParty" xlink:label="loc_us-gaap_InterestExpenseRelatedParty_0d2ebd78-c69b-4524-83b6-a91ddf07213c" 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_326571dd-2089-b65a-821d-3163d8518a05" xlink:to="loc_us-gaap_InterestExpenseRelatedParty_0d2ebd78-c69b-4524-83b6-a91ddf07213c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_45763918-4e7f-82ea-bed7-7a6a842404f1" 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_326571dd-2089-b65a-821d-3163d8518a05" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_45763918-4e7f-82ea-bed7-7a6a842404f1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_6a75c878-dfaf-e368-936e-ce293fe86f6f" 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_82a1dba8-8b5a-130a-edce-afbb0d3a199c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_6a75c878-dfaf-e368-936e-ce293fe86f6f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_63bbe84c-b938-87b9-5103-68b80738d584" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_aaf4fade-f652-62f8-cf02-c59447905641" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_63bbe84c-b938-87b9-5103-68b80738d584" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.westlake.com/role/DeferredChargesAndOtherAssets" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DeferredChargesAndOtherAssetsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DerivativeCommodityInstrumentsDerivativeCommodityInstruments" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DerivativeCommodityInstrumentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DescriptionOfBusinessAndBasisOfPresentation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DescriptionOfBusinessAndBasisOfPresentationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DescriptionOfBusinessAndBasisOfPresentationPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnit" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitBasicAndDilutedIncomePerLimitedPartnerUnitDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitDistributionPerCommonUnitDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitDistributionsDeclaredDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitIncomeInExcessOfDistributionDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DistributionsAndNetIncomePerLimitedPartnerUnitTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/FairValueMeasurementsSummaryOfCarryingAndFairValuesOfLongTermDebtDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/Inventories" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/InventoriesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_aa7cc103-d668-cf3b-6875-81c99ffeac19" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryFinishedGoods" xlink:label="loc_us-gaap_InventoryFinishedGoods_b4994565-276e-19f8-ba9d-e3a584b51998" 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_aa7cc103-d668-cf3b-6875-81c99ffeac19" xlink:to="loc_us-gaap_InventoryFinishedGoods_b4994565-276e-19f8-ba9d-e3a584b51998" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryWorkInProcessAndRawMaterials" xlink:label="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_99925e14-0f0a-95d2-65ca-d974b1a3aab3" 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_aa7cc103-d668-cf3b-6875-81c99ffeac19" xlink:to="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_99925e14-0f0a-95d2-65ca-d974b1a3aab3" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.westlake.com/role/InventoriesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/LongTermDebtPayableToWestlake" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/LongTermDebtPayableToWestlakeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/LongTermDebtPayableToWestlakeTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/PartnersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/PartnersEquityDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/PropertyPlantAndEquipment" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/PropertyPlantAndEquipmentDetail" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsAccountsReceivableFromAndAccountsPayableToRelatedPartiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsCostOfSalesFromRelatedPartiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsDebtPayableToRelatedPartiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsGeneralDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsGoodsAndServicesPurchasedFromWestlakeAndCapitalizedAsAssetsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsMajorCustomerAndConcentrationRiskDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsSalesToRelatedPartiesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsServicesFromRelatedPartiesIncludedInSgaExpensesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsSiteLeaseAgreementsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/RelatedPartyTransactionsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/SupplementalInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.westlake.com/role/SupplementalInformationDetails" xlink:type="extended" />
</link:linkbase>
