Percent Error Calculator

Fast, free, accurate and 100% private. Works on any device.

Percent Error Calculator

Enter your values below and click the button for instant results.

Percent Error

Observed Value

True / Expected Value

Result

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About Percent Error Calculator

This Percent Error Calculator is fast, accurate and 100% private. All calculations run locally in your browser, so your information never leaves your device. No sign-up, no downloads, works beautifully on mobile and desktop.

FAQ

What is percent error?▶

Percent error measures how far an observed value is from the true/expected value as a percentage. Formula: |observed - true| / true * 100.

Why is it always positive?▶

Percent error uses absolute value because we want to measure the magnitude of the error, not its direction.