Sheet1PMP Formulas mentioned in the PMBOK Guide 5th EditionPMP FormulasSl.No.Name (Abbreviation)FormulaInterpretation1No. of Communication Channelsn (n-1)/2n should include the project managern = number of members in the teame.g. if the no. of team members increase from 4 to 5, the increase in communication channels:5(5-1)/2 4(4-1)/2 = 42Schedule Performance Index (SPI)SPI = EV/PV< 1 behind schedule= 1 on scheduleEV = Earned Value> 1 ahead of schedulePV = Planned Value3Cost Performance Index (CPI)CPI = EV/AC< 1 Over budget= 1 On budgetEV = Earned Value> 1 Under budgetAC = Actual Costsometimes the term cumulative CPI would be shown, which actually is the CPI up to that moment4Schedule Variance (SV)SV = EV PV< 0 Behind schedule= 0 On scheduleEV = Earned Value> 0 Ahead of schedulePV = Planned Value5Cost Variance (CV)CV = EV AC< 0 Overbudget= 0 On budgetEV = Earned Value> 0 Within budgetAC = Actual Cost6Estimate at Completion (EAC) if original is flawedEAC = AC + New ETCif the original estimate is based on wrong data/assumptions or circumstances have changedAC =Actual CostNew ETC = New Estimate to Completion7Estimate at Completion (EAC) if BAC remains the sameEAC=AC + BAC EVthe variance is caused by a one-time event and is not likely to happen againAC =Actual CostBAC = Budget at completionEV = Earned Value8Estimate at Completion (EAC) if CPI remains the sameEAC= BAC/CPIif the CPI would remain the same till end of project, i.e. the original estimation is not accurateBAC = Budget at completionCPI = Cost performance index9Estimate at Completion (EAC) if substandard performance continuesEAC=AC + (BAC - EV)/(CPI*SPI)use when the question gives all the values (AC, BAC, EV, CPI and SPI), otherwise, this formula is not likely to be usedAC =Actual CostBAC = Budget at completionEV = Earned ValueCPI = Cost Performance IndexSPI = Schedule Performance Index10To-Complete Performance Index (TCPI)TCPI= (BAC EV)/ (BAC AC)< 1Underbudget= 1 On budget> 1 Over budgetBAC = Budget at completionEV = Earned valueAC =Actual CostTCPI= Remaining Work /Remaining FundsBAC = Budget at completionEV = Earned valueCPI = Cost performance index11Estimate to CompletionETC= EAC -ACEAC = Estimate at CompletionAC = Actual Cost12Variance at CompletionVAC= BAC EAC< 0 Underbudget= 0 On budgetBAC = Budget at completion> 0 Over budgetEAC = Estimate at Completion13PERT Estimation(O + 4M + P)/6O= Optimistic estimateM= Most Likely estimateP= Pessimistic estimate14Standard Deviation(P O)/6this is a rough estimate for the standard deviationO= Optimistic estimateP= Pessimistic estimate15Float/SlackLS ES= 0 On critical path< 0 Behind scheduleLS = Late startES = Early startLF EFLF = Late finishEF = Early finishThe above 17 PMP formulas are all that youll need for the PMP Exam. Learn them and understand their application. You will be able to solve the calculation questions in the certification exam.However, if you are still struggling with PMP formulas or you want some more guided descriptions on how to apply them with PMP practice questions, you are advised to explore the PM Exam Formulas Study Guideauthored by Cornelius Fitchner (the same author of the acclaimed online PMP Exam Prep course which I used to clear my PMP exam thePM PrepCast).

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