Cost Performance Index Calculator
Calculate CPI to measure cost efficiency
About this calculator
The Cost Performance Index (CPI) Calculator helps project managers and financial analysts measure cost efficiency by comparing earned value to actual costs incurred. This essential project management metric indicates whether you're over or under budget, with values above 1.0 showing cost efficiency and values below 1.0 indicating cost overruns. By calculating CPI regularly, you can identify budget trends early, make informed decisions about resource allocation, and take corrective action to keep projects financially on track.
How to use
Enter your project's Earned Value (the budgeted cost of completed work) and Actual Cost (total money spent to date). The calculator will automatically compute your CPI by dividing Earned Value by Actual Cost. A result greater than 1.0 means you're under budget, while less than 1.0 indicates overspending.
Frequently asked questions
What does a CPI of 1.2 mean?
A CPI of 1.2 means you're performing 20% better than budgeted, getting $1.20 worth of work for every dollar spent.
When should I calculate CPI?
Calculate CPI regularly throughout your project lifecycle, typically during monthly reviews or at major milestones to track cost performance trends.
What's considered a good CPI value?
A CPI above 1.0 is good, indicating cost efficiency. Values between 0.95-1.05 are typically acceptable, while below 0.95 requires attention.