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Calculating Schedule Performance Index (SPI)

The Schedule Performance Index (SPI) describes the relationship at the project or task level between the planned schedule and actual schedule. Project managers review this metric to identify tasks or projects are currently tracking ahead of or behind schedule at a given point.  

Understanding SPI

Understanding the SPI Value

Project managers understand that a SPI value of 1 means the project is on plan or on schedule.  Values greater than 1 indicate a project is ahead of schedule, and values less than 1 mean a project is behind schedule.  The further from 1, the greater deviation from the plan.

CPI Value Indication on Budget
1 On plan or budget
> 1 (greater than 1) Under budget
< 1 (less than 1) Over budget


Understanding How SPI Is Calculated

SPI = (Total Planned Hours x % Complete) / Planned Hours Scheduled to Date*

*If Planned Hours Scheduled to Date = 0, SPI = 1.

Planned Hours Schedule to Date are calculated at the minute when you perform the calculations. It shows the number of planned hours planned to the current date. It can be recalculated automatically when you change your finance data to be accurate. There is no field in Workfront that indicates this value.

For example, if you have a project with 1 task and the task has 10 planned hours and a 10-Day duration, the Planned Hours Schedule to Date on the 5th day are 5. 

Locating SPI in a Project or Task

  1. Navigate to the project or task where you want to view SPI.
  2. Click the Project Details tab or the Task Details tab, depending on whether you are viewing SPI for a project or task.
  3. Click Finance.