To illustrate the concept of EVM and all the formulas, assume a project that has exactly one task. The task was baselined at 8 hours, but 11 hours have been spent and the estimate to complete is 1 additional hour. The task would have been completed already.
Assume an Hourly Rate of $100 per hour.
Using this information -
PV or BCWS = Hourly Rate × Total Hours Planned or Scheduled
PV = $100 × 8 hours = $800
AC or ACWP = Hourly Rate × Total Hours Spent
AC = $100 × 11 hours = $1100
EV or BCWP = Baselined Cost × % Complete Actual
EV = baseline of $800 × 91.7% complete = $734
(NOTE % Complete Actual (below) to get the 91.7%)
BAC = Baselined Effort − hours × Hourly Rate
BAC = 8 hours × $100 = $800
EAC = AC + ETC
EAC = 1100 + 100 = $1200
VAC = BAC − EAC
VAC = $800 − $1200 = −$400
% Completed Planned = PV ⁄ BAC
% Complete Planned = $800 PV ⁄ $800 BAC = 100%
% Completed Actual = AC ⁄ EAC
% Complete Actual = $1100 AC ⁄ $1200 EAC = 91.7%
SV = Earned Value (EV) − Planned Value (PV)
SV = $734 EV − $800 PV = −$66
SPI = Earned Value (EV) ⁄ Planned Value (PV)
SPI = $734 EV ⁄ $800 PV = 0.91
CV = Earned Value (EV) − Actual Cost (AC)
CV = ($734 EV − $1100 AC) = −$366*
* indicates a cost overrun
CPI = Earned Value (EV) ⁄ Actual Cost (AC)
CPI = $734 EV ⁄ $1100 AC = 0.66*
* indicates over-budget