EAC scenario calculator
Compare forecasts under different assumptions instead of using one formula blindly.
Methodology note. Formulas are based on established Earned Value Management terminology. Core references include Project Management Institute (PMI) educational resources and U.S. Department of Energy EVM guidance. Last reviewed: August 14, 2026. Read methodology · View sources
There is more than one EAC formula
The correct EAC approach depends on the forecast assumption. If past variance is considered atypical, remaining work may be budgeted at the original rate. If current cost efficiency is expected to continue, BAC ÷ CPI is commonly used. If both cost and schedule performance are expected to influence the remaining work, CPI and SPI can be combined. A credible new bottom-up ETC can also replace index-based forecasting.
Temporary variance
EAC = AC + (BAC − EV)Current cost efficiency continues
EAC = BAC ÷ CPICost and schedule performance continue
EAC = AC + (BAC − EV) ÷ (CPI × SPI)Bottom-up forecast
EAC = AC + ETCOnce you choose a forecast, calculate ETC, VAC and TCPI against the relevant target.