Percent Error Calculator
Calculate percent error and percent difference between values.
Result
About the Percent Error Calculator
What is Percent Error?
Percent error measures the accuracy of an experimental value compared to a known or theoretical value. It expresses the size of the error as a percentage of the theoretical value.
How to Use
Enter the experimental (measured) value and the theoretical (accepted) value, then click Calculate. The tool returns percent error, absolute error, and percent difference.
What is the difference between percent error and percent difference?
Percent error compares an experimental value to a known theoretical value. Percent difference compares two experimental values to each other without a reference value.
Can percent error be negative?
The calculator uses the absolute value, so percent error is always non-negative. The sign of the raw difference tells you if the experimental value was too high or too low.
What does a high percent error mean?
A high percent error indicates poor accuracy, which may result from measurement error, experimental limitations, or incorrect assumptions.
Is this calculator free?
Yes, BestCalc's percent error calculator is completely free with no ads or registration required.