Percent error
Percent error: use observed value, reference value. Review the formula, worked example and calculation steps.
Inputs
Use the units shown—
Enter your values and select Calculate.
Formula & explanation
Error % = |observed−reference|/|reference| × 100
Variables & units
- Observed value
- Numeric value · minimum -1000000000000, maximum 1000000000000
- Reference value
- Numeric value · minimum -1000000000000, maximum 1000000000000
Worked example
48 observed compared with 50 reference gives 4% error.
Assumptions
Uses an absolute reference magnitude; the error is non-negative.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
Use the default input values to find the answer. The reset icon restores those values.
Calculated on your device. Your latest 100 calculations stay in this browser.