PMP Formula: Schedule Performance Index

PMP Formula Schedule Performance Index (SPI)

Schedule Performance Index (SPI) is a ratio of the earned value (EV) to the planned value (PV). It is used to check whether the project is running at the expected rate or behind the schedule or ahead of schedule. Equation: Schedule Performance Index (SPI) = Earned Value ÷ Planned Value.

Formula Definition
SPI Schedule Performance Index
  • = EV ÷ PV

  • If SPI value > 1, it indicates that project is going at a faster rate. good

  • If SPI value = 1, it indicates that project is going at the same rate as expected.

  • If SPI value < 1, it indicates that project is going at a slower rate.
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