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 = EV / PV

Variables:

- 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).

- First, determine the Earned Value (EV) ($).
- Next, determine the Planned Value (PV) ($).
- Next, gather the formula from above = SPI = EV / PV.
- Finally, calculate the Schedule Performance Index.
- 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