# Percent Error Equation Formula Calculator

## Percentage Error Calculator – Calculate Percentage Error

If said realistically, our measured values are usually different from true values. ACalculator has designed the Percent Error Calculator to help you in resolving statistical and practical issues. The Percent Error Calculator will show you the difference between the true value and your observed value in percentage.
Observed Value
Observed value is the value you derived from statistical or mathematical calculation, or simply from observation.
True Value
Insert the value of your calculation problem that is already given or historically proven as the correct value.
Percent Error
The percent error is calculated using the following formula:

(True Value – Observed Value) / True Value| X 100 This formula is only applicable when the true value for any given problem is known. If the true value is not certain, you will have to use Standard Deviation to find out the error in your calculation.