How do you calculate percent error?

Percent error = |measured − actual| / |actual| × 100. If you measured 9.80 and the true value is 9.81, the percent error is about 0.10%.

What's the difference between absolute and relative error?

Absolute error is the raw difference |measured − actual|. Relative error divides that by the true value; multiply by 100 for percent error.

Percent Error Calculator

Free percent error calculator. Enter a measured (experimental) value and the actual (true) value to get the percent error, absolute error and relative error — commonly used in science labs and measurements.

Compare a measured value to the true value as a percent error.

% error = \frac{∣ measured - actual ∣}{∣ actual ∣} \times 100

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