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Cost Variance (CV)

Cost variance (CV) measures the difference between the budgeted cost of work performed and the actual cost incurred. Learn the CV formula, how to interpret positive and negative values, and when to use CV versus CPI.
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By ClickUp Editorial Team·Staff Writers at ClickUp

How Cost Variance Works

Cost variance is an earned value metric that expresses the budget deviation in absolute dollar terms. The formula is CV = EV minus AC. A positive CV means the project is under budget: the work completed cost less than budgeted. A negative CV means the project is over budget: the work completed cost more than budgeted. A CV of zero means the project is exactly on budget.

CV answers the question: how many dollars are we over or under budget right now? This makes it useful for communicating budget status to stakeholders who think in dollars rather than ratios. Telling an executive “we have a negative cost variance of $45,000” is more immediately understandable than “our CPI is 0.92.”

How to Calculate CV

CV = EV minus AC. Example: A project team has completed work budgeted at $150,000 (EV) and spent $165,000 (AC) to do it. CV = $150,000 minus $165,000 = negative $15,000. The project is $15,000 over budget. The corresponding CPI would be $150,000 / $165,000 = 0.91.

When to Use CV vs CPI

Use CV when communicating the magnitude of a cost deviation to stakeholders. Use CPI when analyzing efficiency trends over time and forecasting final project cost. Both are derived from the same data (EV and AC). CV gives you the dollar impact. CPI gives you the rate of efficiency. A project could have a small CV early on but a CPI that signals a much larger problem at completion.

When CV Is Less Useful

CV alone does not indicate the severity of the problem relative to the project size. A CV of negative $50,000 on a $10M project is negligible. The same CV on a $200,000 project is critical. Always consider CV as a percentage of BAC or alongside CPI for context.

Commonly Confused With

TermKey Difference
CPI (Cost Performance Index) CV is an absolute dollar amount (EV minus AC). CPI is a ratio (EV / AC). CV shows magnitude of the variance. CPI shows the rate of cost efficiency.
Schedule Variance (SV) → CV measures cost deviation (EV minus AC). SV measures schedule deviation (EV minus PV). Both use earned value but compare it to different baselines.
Budget Variance In accounting, budget variance compares planned spending to actual spending. In EVM, cost variance compares earned value to actual cost, accounting for work accomplished rather than just time elapsed.
Use Custom Fields for EV and AC, formula fields for CV calculation, and Dashboard charts to monitor budget deviation.
Track Cost Variance in ClickUp

Common Questions About Cost Variance (CV)

What is the cost variance formula?
CV = EV minus AC. Earned Value (budgeted cost of work completed) minus Actual Cost (money spent). A positive result means under budget. A negative result means over budget. Zero means exactly on budget.
What does a negative cost variance mean?
A negative CV means the project has spent more money than the budgeted value of the work completed. The project is over budget. The magnitude of the negative number tells you by how many dollars.
When should I use CV instead of CPI?
Use CV when communicating the dollar impact to stakeholders ("we are $30,000 over budget"). Use CPI when analyzing trends and forecasting ("at this efficiency rate, the project will cost $X at completion"). Both come from the same data and complement each other.