Math Updated: February 1, 2026

Percent Error Calculator

Calculate percent error between an observed (measured) value and a true (accepted) value. Results update automatically as you type.

Inputs

Also called the theoretical value or accepted value in science.
Also called the experimental value or measured value.

Result

Percent Error Formula = (Observed − True) / True × 100

Percent error
Signed percent error
Interpretation
Difference (Observed − True) (signed)
Absolute difference |Observed − True|
Absolute percent error
Relative error (as a decimal)
Enter True value and Observed value to calculate percent error.
Step-by-step solution
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