Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Project Management
Schedule Performance Index Calculator
Calculate the Schedule Performance Index (SPI) — the ratio of Earned Value to Planned Value — to measure whether a project is ahead of, on, or behind schedule. Use it as a core EVM metric for project status reporting and forecasting completion.
Fill in the required fields to see your result.
Project Management
Project Duration Calculator
Estimate total project duration in days by dividing total work (tasks × average duration) by the number of tasks that can run in parallel. Use it for rough early-stage project planning, capacity-vs-deadline checks, or sprint capacity estimation in agile teams.
Fill in the required fields to see your result.
Key differences
| Schedule Performance Index Calculator | Project Duration Calculator | |
|---|---|---|
| Category | Project Management | Project Management |
| Inputs required | 2 | 3 |
| Result | Schedule Performance Index | Project Duration (days) |
| What it does | Calculate the Schedule Performance Index (SPI) — the ratio of Earned Value to Planned Value — to measure whether a project is ahead of, on, or behind schedule. Use it as a core EVM metric for project status reporting and forecasting completion. | Estimate total project duration in days by dividing total work (tasks × average duration) by the number of tasks that can run in parallel. Use it for rough early-stage project planning, capacity-vs-deadline checks, or sprint capacity estimation in agile teams. |