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Percent error calculator

Calculate percent error, absolute error and relative error between a measured value and the accepted or theoretical value.

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Input

Measured (experimental) valueAccepted (theoretical) value

Your result

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How to use this tool

Enter your values or choose a local file. Replace the example data with your own.
Review options, units and assumptions, then run the tool.
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Method & assumptions

Calculate percent error, absolute error and relative error between a measured value and the accepted or theoretical value.

% error = |measured − accepted| ÷ |accepted| × 100

Worked example

Measured (experimental) value: 9.62
Accepted (theoretical) value: 9.81

→ Percent error: 1.9368 %
→ Signed percent error: -1.9368 %
→ Absolute error: 0.19
→ Relative error: 0.019368