Percent Error Calculator
Free online Percent Error Calculator.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
Percent Error = |Experimental - Accepted| / |Accepted| x 100%. Measures accuracy of measurement. Absolute value ensures positive result regardless of direction.
Example Calculations
Lab Measurement
Input: Experimental: 9.8, Accepted: 9.81
Result: Percent error: 0.10%
Engineering
Input: Measured: 102 mm, True: 100 mm
Result: Percent error: 2.00%
Overestimate
Input: Experimental: 25.5, Accepted: 24.0
Result: Percent error: 6.25%
About This Calculator
Free online percent error calculator. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our percent error calculator is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
What is percent error?
|Measured - Accepted| / |Accepted| x 100%. Measures measurement accuracy.
Why absolute value?
Ensures positive result, focusing on error magnitude regardless of direction.
Acceptable percent error?
Depends on context. High school: 5-10%. Professional research: <1%. Engineering varies by application.
Percent error vs difference?
Error compares to known value. Difference compares two experimental values using their average.
Reduce percent error?
Precise instruments, calibration, multiple measurements averaged, controlled environment.