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

True value

Also called the theoretical value or accepted value in science.

Observed value

Also called the experimental value or measured value.

Formula

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

Outputs

Percent error

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Signed percent error

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Interpretation

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Difference (Observed − True) (signed)

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Absolute difference |Observed − True|

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Absolute percent error

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Relative error (as a decimal)

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Enter True value and Observed value to calculate percent error.

Step-by-step solution

Step 1

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Step 2

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Step 3

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