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July 8, 2026What's the difference between EAC formulas?
PMBOK lists 4 EAC formulas: BAC/CPI, AC + (BAC-EV), AC + bottom-up ETC, and AC + (BAC-EV)/(CPI*SPI). When do you use each one? I keep getting different answers on practice exams.
Use BAC/CPI when the current cost variance is typical of future work. Use AC + bottom-up ETC when past performance isn't representative. Use the CPI*SPI formula when both cost AND schedule affect future costs. The exam tip: if the question says 'assuming current trends continue,' use BAC/CPI.
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