Percent Error Calculator

Your details

Choose what to calculate. The two "reverse-solve" modes let you find a missing value when you already know the percent error.
The value you observed or measured in your experiment.
The accepted, expected, or exact value used as the standard of truth.
Off (default): percent error is always positive (uses absolute value). On: positive means the measurement was too high, negative means too low.
Percent errorExcellent agreement
0.1019%
Absolute error0.01
Relative error0.001019
0.1019 %
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Your measurement differs from the true value by 0.1%.

  • The absolute value convention keeps this positive regardless of direction.
  • Percent error always divides by the theoretical (true) value, not the measured one.
  • The raw absolute error is 0.01 and the relative error is 0.001019.
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