PMP Exam Formulas

(Program Evaluation and Review Technique) PERT PERT = (P + 4M + O )/ 6

  • O= Optimistic estimate
  • M= Most Likely estimate
  • P= Pessimistic estimate
Standard Deviation (SD) SD = P – O) / 6

  • O= Optimistic estimate
  • P= Pessimistic estimate
Float/Slack Late start – Early start
Late finish – Early finish
Communication Channels n (n-1)/2

  • n = number of members in the team
Cost Performance Index (CPI) CPI = EV/AC

  • EV = Earned Value
  • AC = Actual Cost
Schedule Performance Index (SPI) SPI = EV/PV

  • EV = Earned Value
  • PV = Planned Value
Cost Variance (CV) CV = EV – AC

  • EV = Earned Value
  • AC = Actual Cost
Schedule Variance (SV) SV = EV – PV

  • EV = Earned Value
  • PV = Planned Value
Estimate At Completion (EAC) 1. BAC / CPI  — if CPI remains the same

  • BAC = Budget at completion
  • CPI = Cost performance index

2. AC + ETC — Initial Estimates are flawed

  • AC = Actual Cost
  • New ETC = New Estimate to Completion

3. AC + BAC – EV — if BAC remains the same

  • AC = Actual Cost
  • BAC = Budget at completion
  • EV = Earned Value
Estimate To Completion (ETC) ETC = EAC -AC

  • EAC = Estimate at Completion
  • AC = Actual Cost
Variance At Completion (VAC) VAC = BAC – EAC

  • BAC = Budget at completion
  • EAC = Estimate at Completion