Calculate the percent error between an estimated (experimental) value and the true (actual) value.
Percent Error Calculator
Math
Inputs
How useful was this tool?
Enter the experimental (measured) value.
Enter the theoretical (actual) value.
Click Calculate.
Percent Error = |Experimental − Theoretical| / |Theoretical| × 100%. Used in science to measure the accuracy of an experiment or measurement.
In most science experiments, under 5% is acceptable. Under 1% is excellent. Over 10% usually requires investigating sources of error.