# 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