Enter the Earned Value and Planned Value into the calculator to determine the Schedule Performance Index. This calculator can also evaluate any of the variables given the others are known.

Schedule Performance Index Formula

The following formula is used to calculate the Schedule Performance Index (SPI).



  • SPI is the Schedule Performance Index
  • EV is the Earned Value ($)
  • PV is the Planned Value ($)

To calculate the Schedule Performance Index, divide the Earned Value by the Planned Value. The result is the SPI, which indicates how efficiently the project schedule is being managed. A SPI greater than 1 indicates the project is ahead of schedule, while a SPI less than 1 indicates the project is behind schedule.

What is a Schedule Performance Index?

The Schedule Performance Index (SPI) is a numerical index that measures the efficiency of time utilization in a project. It is calculated by dividing the earned value (EV) by the planned value (PV). An SPI score of less than 1 indicates that the project is behind schedule, a score of 1 means the project is on schedule, and a score greater than 1 means the project is ahead of schedule. It is a crucial tool in project management for tracking progress and predicting future performance.

How to Calculate Schedule Performance Index?

The following steps outline how to calculate the Schedule Performance Index (SPI).

  1. First, determine the Earned Value (EV) ($).
  2. Next, determine the Planned Value (PV) ($).
  3. Next, gather the formula from above = SPI = EV / PV.
  4. Finally, calculate the Schedule Performance Index.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Earned Value (EV) ($) = 120

Planned Value (PV) ($) = 100