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Both calculators run independently — change the inputs on either side to compare results.

Cost Performance Index Calculator

Calculate the Cost Performance Index (CPI) — the ratio of Earned Value to Actual Cost — to measure cost efficiency. Use it as a core EVM metric to determine whether the project is delivering value efficiently or overrunning the budget.

Earned Value ($)

Actual Cost ($)

Fill in the required fields to see your result.

Project Management

Budget Variance Calculator

Calculate budget variance as a percentage by comparing actual spending against planned budget. Use it for project cost control, financial reporting, and identifying overrun risk early enough to take corrective action.

Planned Budget ($)

Actual Spent ($)

Fill in the required fields to see your result.

Key differences

	Cost Performance Index Calculator	Budget Variance Calculator
Category	Project Management	Project Management
Inputs required	2	2
Result	Cost Performance Index	Budget Variance (%)
What it does	Calculate the Cost Performance Index (CPI) — the ratio of Earned Value to Actual Cost — to measure cost efficiency. Use it as a core EVM metric to determine whether the project is delivering value efficiently or overrunning the budget.	Calculate budget variance as a percentage by comparing actual spending against planned budget. Use it for project cost control, financial reporting, and identifying overrun risk early enough to take corrective action.