PMP Formula Cheet Sheet
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| Keywords | Formulas |
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Schedule Performance Index (SPI) Ratio between EV and PV, to reflect whether the project work is ahead of / on / behind schedule in relative terms |
SPI = EV/PV EV = Earned Value PI = Planned Value < 1 Project is behind schedule = 1 Project is on schedule > 1 Project is ahead of schedule |
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Cost Performance Index (CPI) Ratio between EV and AC, to reflect whether the project work is under / on / over budget in relative terms |
CPI = EV/AC EV = Earned Value AC = Actual Cost < 1 Over budget = 1 On budget > 1 Under budget |
|
Schedule Variance (SV) Whether the project is ahead of or behind schedule |
SV = EV - PV EV = Earned Value PV = Planned Value Negative is behind schedule Zero is on schedule Positive is ahead of schedule |
| Cost Variance (CV) |
CV = EV - AC EV = Earned Value AC = Actual Cost Negative is over budget Zero is on budget Positive is under budget |
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Estimate At Completion (EAC) The estimated total amount of money needed to be put into the project based on the information available as today |
EAC = BAC/CPI BAC = Budget at completion CPI = Cost performance index |
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Estimate To Complete (ETC) when original estimates are flawed How much more do we need to put into the project to complete it |
ETC = EAC - AC EAC = Estimate at completion AC = Actual Cost |
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Estimate To Complete (ETC) when variance are typical How much more do we need to put into the project to complete it |
ETC = (BAC - EV)/CPI BAC = Budget at completion EV = Earned Value CPI = Cost performance index |
|
Estimate To Complete (ETC) when variance atypical How much more do we need to put into the project to complete it |
ETC = BAC - EV BAC = Budget at completion EV = Earned Value |
| Number of Communication Channels |
N(N-1)/2 Where N = Number of project team members |
|
Expected Value (EV) or PERT Estimation How much work was completed to date |
(O + 4M + P)/6 O = Optimistic estimate M = Most Likely estimate P = Pessimistic estimte |
| To-Complete Performance Index (TCPI) base on the BAC |
TCPI = (BAC - EV)/(BAC - AC) BAC = Budget at completion EV = Earned Value AC = Actual Cost |
| To-Complete Performance Index (TCPI) base on the EAC | TCPI = (BAC - EV)/(EAC - AC)
BAC = Budget at completion EV = Earned Value AC = Actual Cost EAC = Estimate at completion |
| Total Float (or) Total Slack |
LS - ES (or) LF - EF LS = Late start ES = Early start LF = Late finish EF = Early finish |
| Standard Deviation of a Task |
(P - O)/6 P = Pessimistic estimte O = Optimistic estimate |
|
Present Value (PV) How much work was scheduled to date |
PV = FV/(1 + r/100)n n = Number of years r = Discount rate |
| Future Value (FV) |
FV = PV/(1 + r/100)n n = Number of years r = Discount rate |
| Net Presnet Value (NPV) | The higher the better |
| Internal Rate of Return (IRR) | The higher the better |
| The Payback Period | The lower the better |
| The Life Cycle Cost | The lower the better |
| The Benefit to Cost Ratio (BCR) | The higher the better |
| Critical Path | Path with longest duration |
| Rough Order of Magnitude (ROM) Estimate | Estimated value + or - 50% |
| Variance | (Standard Deviation) * (Standard Deviation) |