Estimated at Completion (EAC) calculation:
EAC = (total project budget)/CPI
EAC is a forecast of how much a total project will cost.
Let’s take a look at an example to gauge project performance so far. Assume we’re halfway through a year-long project that has a total budget of $100,000. The amount budgeted through this six-month mark is $55,000. The actual cost at the six-month mark is $45,000.
Earned value analysis summary:
- Planned Value (PV) = $55,000
- Actual Cost (AC) = $45,000
- Earned Value (EV) = ($100,000 * 0.5) = $50,000
- Schedule Variance (SV) = EV–PV = $50,000-$55,000 = -$5,000 (bad because <0)
- Schedule Performance Index (SPI) = EV/PV = $50,000/$55,000 = 0.91 (bad because <1)
- Cost Variance (CV) = EV–AC = $50,000-$45,000 = $5,000 (good because >0)
- Cost Performance Index (CPI) = EV/AC = $50,000/$45,000 = 1.11 (good because >1)
- Estimated at Completion (EAC) = (Total Project Budget)/CPI = $100,000/1.11 = $90,000
Since SV is negative and SPI is <1, the project is behind schedule. We’re 50% of the way through the project but have planned for 55% of the costs to be used. There will have to be some catch-up in the second half of the project.
Because CV is positive and CPI is >1, the project is considered to be under budget. We’re 50% of the way through the project, but our costs so far are only 45% of our budget. If the project continues at this pace, then the total cost of the project (EAC) will only be $90,000, as opposed to our original budget of $100,000.
Understanding the project cost and schedule throughout its lifecycle is an essential part of overseeing any project. By using the EVM calculations you can determine if the project is ahead of schedule or behind, as well as the actual cost of work performed and as it progresses.