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Home/Math Calculators/Percent Error Calculator

Percent Error Calculator

Calculate percentage error

Experimental Value

Theoretical (Accepted) Value

Math

View All Math Calculators →

Written by the EachTools Team

Last updated: January 2026

How Percent Error Is Calculated

Percent error measures how inaccurate a measurement is compared to the true or accepted value.

Formula

% Error = |(Measured - Actual) / Actual| × 100

Steps

Enter the measured (experimental) value.
Enter the actual (accepted) value.
View the percent error.