Calculate EVM metrics (CPI, SPI, EAC, ETC, VAC) with S-curve charts, performance indices, and forecast-at-completion analysis.
Translate a project's status-date baseline and actuals into cost and schedule performance indicators plus an updated completion forecast. Enter budget at completion (BAC), planned value (PV), earned value (EV), and actual cost (AC); the result reports CPI, SPI, EAC, ETC, and VAC, while the S-curve shows cumulative separation over time. The common mistake is treating EV as revenue or spending. EV is the budgeted value of work actually completed at the status date.
A concrete input and expected output from the current implementation.
Input
BAC: $100,000 PV: $40,000 EV: $40,000 AC: $40,000
Expected output
CPI: 1.00; SPI: 1.00; EAC: $100,000; ETC: $60,000; VAC: $0
Both indices are 40,000 / 40,000 = 1.00. Common index-based forecast formulas therefore coincide at BAC; ETC is 100,000 - 40,000 = 60,000, and VAC is 100,000 - 100,000 = 0.
At a chosen status date, planned value (PV) is the budgeted value of work scheduled, earned value (EV) is the budgeted value of work completed, and actual cost (AC) is what that work cost. The calculator forms CPI as EV divided by AC and SPI as EV divided by PV. Values below 1.00 indicate unfavorable cost or schedule performance, respectively.
Budget at completion (BAC) anchors the cost forecast. EAC is the forecast total cost, ETC is the remaining forecast cost, and VAC is BAC minus EAC. The S-curve compares cumulative PV, EV, and AC across reporting periods; separation between the series shows where planned progress, earned progress, and spending have diverged.
No. CPI and SPI summarize performance through one status date; they do not identify the cause, show whether remaining work differs from completed work, or guarantee that past efficiency will continue. Use the S-curve and project records to investigate the variance, then select a forecast assumption appropriate to the remaining work.
Several accepted EAC equations make different assumptions. One may assume current cost efficiency continues, another may include schedule efficiency, and another may treat the remaining budget as achievable at its original rate. If multiple forecasts are shown, compare their formulas and assumptions rather than treating one total as automatically definitive.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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