Arithmetic

Percent Error Calculator

Compare an experimental result with an accepted value and express the difference as percent error.

Preparing Percent Error Calculator

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Input

Enter the measured value and the accepted value to calculate the percent error directly. You will see the result first and the step-by-step solution below.

Input summary

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Step by Step Calculation

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Calculate first and the full working will appear below automatically.

How to use Percent Error Calculator

Type the experimental result and the accepted reference value, and the calculator will show the relative size of the error as a percentage.

What this calculator is for

This calculator is for labs, measurement checks, and estimation review when you need to report how far a result is from a standard or accepted value.

Tips

Use the accepted value as the reference in the denominator.
Percent error measures size of error, so the result is reported as a positive percentage.
Keep the measured and accepted values in the same unit before comparing them.