AllEasyToolsMathematics
Percent error
Percent error: calculate from your inputs and inspect the formula. No account required. Processing stays in your browser.
Error = |measured−reference|/|reference| × 100
Check units and the formula domain. Numerical results are rounded.
How to use this calculator
- Identify the quantities and convert them to the units shown.
- Apply the formula first, then compare with the substitution and result.
- Check the assumptions and whether the order of magnitude makes sense.
Levels are approximate topic groupings, not a complete curriculum for every country. Numerical results are rounded and may lose precision for extreme or nearly singular inputs.
A practical example
Use these sample inputs to check the calculation before entering your own values.
- Measured value
- 98
- Reference value
- 100
Result for this example
- Absolute error
- 2
- Percent error
- 2 %