# How to calculate CPI and SPI?

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I want someone to provide me with the easiest way and most straightforward way to calculate CPI and SPI. Also, let's assume I already have SPI, is there a formula to calculate CPI from SPI?

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Both CPI and SPI are EVM terms.

SPI (Schedule Performance Index) = Budgeted Cost of Work Performed / Budgeted Cost of Work Scheduled = BCWP / BCWS (An elaborate explanation on how to calculate the SPI can be found here: http://www.projectmanagementquestions.com/1484/how-to-calculate-the-schedule-performance-index )

CPI (Cost Performance Index) =  Budgeted Cost of Work Performed / Actual Cost of Work Performed = BCWP / ACWP

Now since SPI = BCWP / BCWS , then  BCWP = SPI x BCWS

Hence CPI = BCWP / ACWP = (SPI X BCWS) / ACWP

But we know that SV (Schedule Variance) = BCWP - BCWS

This will make BCWS = BCWP - SV

We also know that CV (Cost Variance) = BCWP - ACWP

This will make ACWP = BCWP - CV

So CPI = (SPI x BCWS) / ACWP = (SPI x (BCWP - SV))/  (BCWP - CV)

So there is a way to calculate CPI based on SPI, but you must know a lot of other EVM values (SV, CV, and BCWP)
answered 10 years ago by anonymous

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