PV
Budgeted cost of scheduled work.
EV
Budgeted cost of performed work.
AC
Actual cost of performed work.
Cost variance
CV = EV − AC.
Schedule variance
SV = EV − PV.
CPI
CPI = EV/AC.
SPI
SPI = EV/PV.
EAC (typical)
EAC = BAC/CPI.
EAC (forecast)
EAC = AC + (BAC − EV).
ETC
ETC = EAC − AC.
VAC
VAC = BAC − EAC.
CPI < 1
Over budget.
CPI > 1
Under budget.
SPI < 1
Behind schedule.
SPI > 1
Ahead of schedule.