Project Schedule Performance Index (SPI)
Earned value relative to planned value for project timing
FORMULA
SPI = Earned Value (EV) / Planned Value (PV)
Alternate Calculations
Schedule Variance
EV - PV (in dollars)What is Project Schedule Performance Index?
Schedule Performance Index measures project progress efficiency by comparing Earned Value (work completed) to Planned Value (scheduled work). SPI = EV / PV. Critical for construction project management.
SPI > 1.0 indicates ahead of schedule; SPI < 1.0 indicates behind schedule. Used to forecast project completion and identify schedule risk.
Chart
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Sample Data
| week | pv | ev | spi | status |
|---|---|---|---|---|
| 1 | 100,000 | 95,000 | 0.95 | At Risk |
| 2 | 200,000 | 205,000 | 1.025 | On Track |
| 3 | 300,000 | 315,000 | 1.05 | Ahead |
| 4 | 400,000 | 420,000 | 1.05 | Ahead |
Required Data Columns
earned_valueplanned_valuespi