Percent Error Calculator

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Calculates the difference between an observed value and a true value as a percentage of the true value.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Observed Value and True Value in the units shown.

Step 2

Read Absolute Error and Percent Error in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Observed Value: 10 unit; True Value: 12 unit

Absolute Error: 2 unit; Percent Error: 0.24 %

Observed Value: 25 unit; True Value: 20 unit

Absolute Error: 5 unit; Percent Error: 1 %

Observed Value: 50 unit; True Value: 40 unit

Absolute Error: 10 unit; Percent Error: 4 %

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