▣ CALCULATORS Updated July 25, 2026

Percent Error Calculator

Percent error between measured and true values.

Measured value
True value
Result
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How it works

Percent error is |measured − true| / |true| × 100, the standard formula used in lab reports and science coursework.

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Frequently asked questions

Should percent error be negative?

Convention uses the absolute value, but the tool also shows the signed difference so you can see the direction.

What counts as a good percent error?

It depends on the field: under 5% is typical for school lab work, while precision engineering may require far less.

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