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Percent Error Calculator

Percent Error: The reference value must be nonzero; also displays signed relative error..

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Percent Error Calculator for United States

US · 12,345.67US customary measurementsRoad distance: miles

United States display and unit preferences. The stated calculation method is used. Review the labeled units before entering your values.

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Results update instantly as you change the inputs.

Percent error

2%

United States · calculated from your inputs

Signed relative error2%
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How this result was calculated

  1. Percent error = |observed − reference| / |reference| × 100.
  2. Country setup: United States. Displayed measurements are converted to the formula's base units internally.

Assumption: The reference value must be nonzero; also displays signed relative error. United States display and unit preferences. The stated calculation method is used. Review the labeled units before entering your values.

Calculation version 1.0.0 · Support state: generic

Formula and method

Percent error = |observed − reference| / |reference| × 100.

This calculation uses the values you enter. It runs in your browser and does not request a location or account.

Worked example

102 versus 100 gives 2% error.

Questions people ask

Which method does this tool use?

Percent error = |observed − reference| / |reference| × 100.

What should I check before using the result?

The reference value must be nonzero; also displays signed relative error.