Last edited 26 Oct 2020

Schedule performance index (SPI)

The schedule performance index (SPI) is a measure of how close the project is to being completed compared to the schedule.

As a ratio it is calculated by dividing the budgeted cost of work performed, or earned value, by the planned value.

For example:

SPI = EV / PV = 14,400 / 18,000 = 0.8

This means that for every estimated hour of work, the project team is only completing 0.8 hours (just over 45 minutes).

If the ratio has a value higher than 1 this indicates the project is progressing well against the schedule. If the SPI is 1, then the project is progressing exactly as planned. If the SPI is less than 1 then the project is running behind schedule.

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Its just 12/15 no need to multiply the percentage by the budget.


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