What is the Percent Error Calculator?
Calculate the percent error between a measured value and the true value.
Enter measured value and true value and the Percent Error Calculator returns percent error and absolute error. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Percent error = |measured − true| ÷ |true| × 100
How to use it
- Enter measured value.
- Enter true value.
- Read percent error in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Percent Error Calculator use?
It uses: Percent error = |measured − true| ÷ |true| × 100.
What do I need to use the Percent Error Calculator?
You need measured value and true value. Sensible starting values are filled in so you can see how it works straight away.
Is the Percent Error Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.