Divide the error by the exact or ideal value not your experimental or measured value. To calculate the percentage error just follow the formula in this lesson. What is percent error.
Percent Error Error Estimated Value x 100 Note.
Where E is the experimental value and T is the theoretical value. Formula How to Calculate Percentage Error Percentage error is found by dividing the error amount by the original estimate then multiplying that result by 100. Using the Standard Equation 1 Subtract the original value from the new value. For example how to calculate the percentage error.