Online Calculators & Tools

Percent error calculator or converter

Approximated/measured value:
Exact/actual value: 
Percent error:
Percent error non absolute:
Absolute error:

Percent error conversion or formula

Percent error is the difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is the relative error multiplied by 100.

Percent error calculation

The absolute error is equal to the absolute value of the difference between the exact value and the approximated value:

ε = | Vexact - Vapprox |

The percent error is equal to the 100% times the absolute error divided by the exact value:

δ = 100% × | Vexact - Vapprox | / | Vexact |