Earned Value Management, explained without the jargon

The problem EVM solves

"We've spent 60% of the budget" tells you nothing on its own. Spent 60% to deliver 80% of the work? You're ahead. Spent 60% to deliver 40%? You're heading for an overrun. Cost without progress is meaningless, and progress without cost is just as blind. Earned Value Management puts the two on the same axis — money — so schedule and budget can finally be compared in one number.

The three measurements everything is built from

EVM starts with three values, all expressed in currency:

• Planned Value (PV) — the budgeted cost of the work you planned to have done by now. Also called BCWS.
• Earned Value (EV) — the budgeted cost of the work you've actually completed. Also called BCWP. This is the heart of the method.
• Actual Cost (AC) — what that completed work actually cost you. Also called ACWP.

The whole budget at completion is the BAC (Budget At Completion).

The variances: are you ahead or behind?

Both follow the same rule: positive is good, negative is trouble. A negative SV means you've earned less value than you planned to by now — you're behind schedule. A negative CV means the work cost more than it was budgeted for — you're over cost.

The performance indices: CPI and SPI

Variances tell you the size of the gap; the indices tell you the rate, which is what you forecast with.

Read them as efficiency. CPI of 0.80 means you're getting 80 cents of value for every dollar spent. SPI of 1.10 means you're earning value 10% faster than planned. Anything below 1.0 is a warning; above 1.0 is a cushion.

A worked example

A project has a total budget (BAC) of $100,000 over 10 months. At month 5 you'd planned to be halfway, so PV = $50,000. You check the actuals:

Now the diagnosis falls out:

• SV = 40,000 − 50,000 = −$10,000 → behind schedule.
• CV = 40,000 − 55,000 = −$15,000 → over cost.
• SPI = 40,000 ÷ 50,000 = 0.80 → working at 80% of planned pace.
• CPI = 40,000 ÷ 55,000 = 0.73 → 73 cents of value per dollar.

This project is in real trouble on both axes — and you knew it at the halfway mark, not at the end.

Forecasting where you'll land

The most valuable thing EVM does is project the final cost — the Estimate At Completion (EAC). The common form assumes today's cost efficiency continues:

In our example: 100,000 ÷ 0.73 = ~$137,000. The project budgeted at $100k is forecast to finish around $137k unless something changes. The Estimate To Complete (ETC = EAC − AC) is the cash you still need: ~$82,000. The Variance At Completion (VAC = BAC − EAC) is the projected overrun: −$37,000.

The standards behind it

EVM is not a vendor invention — it's codified. The core method aligns with the PMBOK® Guide and is formalised in ANSI/EIA-748; the schedule-forecasting refinement (Earned Schedule) extends SPI into time units so it stays reliable late in a project. PM Vault cites these as authority and reproduces none of them — see our sources.

Doing it without a server

You don't need an enterprise platform to run EVM. A well-built spreadsheet computes every value above the moment you enter actuals — and because the formulas are visible, you can defend each one. When the spreadsheet isn't enough, a dedicated instrument runs live earned value and Earned Schedule for you, on your machine, showing its working.