Earned Value Definitions
Schedule Performance Index (SPI)

What is Schedule Performance Index (SPI)? Earned Value Management explained.

Mia Rutherford
Mia Rutherford
June 11, 2023
5 min read

Schedule Performance Index (SPI) measures the schedule efficiency of the project by comparing the earned value (EV) to the planned value (PV). An SPI value greater than 1 indicates schedule efficiency, while a value less than 1 suggests schedule delays. SPI helps in assessing schedule performance.

Calculation: SPI = EV / PV

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