Percent Error Calculator
Find the percent error between measured and accepted values.
Percent Error:
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Enter values to calculate percent error.
Percent Error Calculator
What this calculator helps you do
Use the percent error calculator to compare an observed value with a reference or accepted value. It is a common way to express how far a result is from the expected answer in labs, measurements, and classroom work.
How percent error is calculated
Percent error is the absolute difference between the observed value and the accepted value, divided by the accepted value, then multiplied by 100.
Worked example
If the accepted value is 50 and your measured value is 47, the absolute error is 3. Divide 3 by 50 and multiply by 100 to get 6 percent error.
How to use the result
- Compare experiment accuracy
- Check whether a measurement is close enough for the task
- Report error in a standard format
Bottom line
This page gives a clear percent error answer and helps you verify whether the difference is small or meaningful.