Calculator Inputs
Enter project values below. Results appear above this form after submission.
Example Data Table
| Project Package | PV | EV | AC | BAC | CPI | SPI | EAC |
|---|---|---|---|---|---|---|---|
| Foundation Works | 120,000 | 105,000 | 115,000 | 240,000 | 0.913 | 0.875 | 262,857.14 |
| Steel Framing | 180,000 | 190,000 | 175,000 | 360,000 | 1.086 | 1.056 | 331,578.95 |
| Mechanical Systems | 95,000 | 82,000 | 90,000 | 210,000 | 0.911 | 0.863 | 230,487.80 |
These example values show how the calculator highlights favorable and unfavorable cost or schedule trends across engineering work packages.
Formula Used
- Cost Variance (CV) = EV - AC
- Schedule Variance (SV) = EV - PV
- Cost Performance Index (CPI) = EV / AC
- Schedule Performance Index (SPI) = EV / PV
- Critical Success Index (CSI) = CPI × SPI
- EAC uses the selected forecasting method.
- Estimate to Complete (ETC) = EAC - AC
- Variance at Completion (VAC) = BAC - EAC
- TCPI = (BAC - EV) / (BAC - AC)
- Percent Complete = (EV / BAC) × 100
Choose the EAC method that best matches project conditions. Stable trends often use CPI-based forecasting, while atypical future work may use AC + (BAC - EV).
How to Use This Calculator
- Enter Planned Value, Earned Value, Actual Cost, and Budget at Completion.
- Add planned and actual durations when you want time-based comparison.
- Select the forecasting method that matches your project assumptions.
- Click the calculate button to generate the result table and chart.
- Download the results as CSV or PDF for reporting.
Frequently Asked Questions
1. What is earned value analysis?
Earned value analysis measures project performance by comparing planned work, completed work, and actual spending. It helps teams judge current efficiency and forecast likely final cost outcomes.
2. Why are PV, EV, and AC important together?
These three values show different dimensions of performance. PV tracks plan, EV tracks completed value, and AC tracks spending. Together they reveal both schedule and cost health.
3. What does CPI below 1 mean?
A CPI below 1 means the project is getting less value than the money spent. This usually signals cost inefficiency and potential overrun risk.
4. What does SPI above 1 mean?
An SPI above 1 means earned progress is ahead of the planned progress baseline. In simple terms, the project is moving faster than scheduled.
5. Which EAC method should I choose?
Use CPI-based methods when current performance likely continues. Use the atypical method when future work will behave differently from past performance. Select the option that best reflects project reality.
6. Can I use any currency or engineering unit?
Yes. The calculations depend on consistent units, not a specific currency. Enter the same unit label across all cost values for clear reporting.
7. Why can VAC become negative?
VAC becomes negative when forecasted final cost exceeds the approved completion budget. That negative value indicates a projected overrun at project completion.
8. How often should I update earned value data?
Update values at each reporting cycle or milestone review. Frequent updates improve trend visibility, forecast accuracy, and decision quality for engineering managers.