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

Schedule Performance Index Calculator

Calculate the Schedule Performance Index (SPI) — the ratio of Earned Value to Planned Value — to measure whether a project is ahead of, on, or behind schedule. Use it as a core EVM metric for project status reporting and forecasting completion.

Earned Value ($)

Planned Value ($)

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

	Schedule Performance Index Calculator	Budget Variance Calculator
Category	Project Management	Project Management
Inputs required	2	2
Result	Schedule Performance Index	Budget Variance (%)
What it does	Calculate the Schedule Performance Index (SPI) — the ratio of Earned Value to Planned Value — to measure whether a project is ahead of, on, or behind schedule. Use it as a core EVM metric for project status reporting and forecasting completion.	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.