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This page provides a percentage error calculator or app. Percent error quantifies the difference between the measured and actual values.

Calculation Instructions/Directions:

  1. Enter Measured Value - This is the measured value or result. It is also known as the observed, estimated or experimental value.
  2. Enter Actual Value - This is the theoretical, known, true, correct, accepted or exact value.


  1. Percent Error - Percent error is the absolute value of the difference of the measured value and the actual value divided by the actual value and multiplied by 100. A small error means the measured value is close to the actual value. A large error means there may be something wrong with the experiment or equipment. Note, this calculator uses the absolute value method for error calculation. The absolute value of a negative number will turn it positive.

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By Jimmy Raymond
AJ Design Software:
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