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EarnedValueCalc / Variance at Completion Calculator

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Variance at Completion Calculator

Calculate forecast budget overrun or underrun by comparing BAC and EAC.

Calculator

Calculate forecast budget overrun or underrun by comparing BAC and EAC.

Original performance budget.
Forecast total cost.
Display currency.
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

Variance at Completion formula

VAC = BAC − EAC

Positive VAC indicates a forecast underrun relative to BAC; negative VAC indicates a forecast overrun.

For context and dependent metrics, continue to the related calculator or use the full earned value calculator.