Math

Percent Error Calculator

Calculate the percent error between an experimental (observed) value and a theoretical (accepted) value.

Using the Percent Error Calculator

Percent error measures the accuracy of an experimental or estimated value compared to a known true or theoretical value. This tool is widely used in science and engineering to quantify the precision of measurements and calculations.

How it Works

Enter the "True Value" (Theoretical).

Enter the "Measured Value" (Experimental).

Review the calculated Percent Error.

Note the "Absolute Error" which shows the raw difference regardless of direction.

Technical Formula


                        Percent Error = [ |Measured - True| / True ] x 100