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Percentage Error Calculator
Calculate the accuracy of experimental measurements
Input Values
The true or accepted value
The observed or measured value
Calculation Results
Percentage Error
2.5%
Absolute Error
0.25
Relative Error
0.025
Accuracy Classification
Excellent
Your measurement shows excellent accuracy with minimal error.
Excellent
0-2%
Good
2-5%
Fair
5-10%
Poor
>10%
Formulas:
Absolute Error = |Experimental - Theoretical|
Relative Error = Absolute Error / |Theoretical|
Percentage Error = Relative Error × 100
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Quick Tips
- • Lower percentage error indicates higher accuracy
- • Percentage error is always positive (absolute value)
- • Used to evaluate precision of measurements in experiments
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Important: Values are estimates; actual results may vary based on measurement conditions and instruments.