Percentage Error Calculator

Percentage error (or percent error) is the difference between an estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In science and engineering, it's used to report the precision of your measurements. The 'Experimental' value is what you measured in your lab, while the 'Theoretical' value is the accepted standard or the value calculated from a known formula. Because we use the absolute value of the difference (the numerator), percent error is almost always expressed as a positive number. A lower percentage error means your measurement was closer to the true value, indicating high accuracy.