Percent Error Calculator

This Percent Error Calculator (% error calculator) will calculate the percentage error between an experimentally measured value and a theoretical actual value.

Percentage Error Formula

Percentage Error=|ET||T|×100Percentage Error=|E−T||T|×100

Where E is the experimental value and T is the theoretical value. This formula is similar to percentage change.

For example, how to calculate the percentage error:

Suppose you did an experiment to measure the boiling point of water and your results average to 101.5°C. This is your experimental (measured) value. We know that the actual boiling point of water is 100°C, so this is your theoretical (actual) value. What is the % error between E = 101.5°C and T = 100°C?

Plug numbers into our percentage error formula

|ET||T|×100|E−T||T|×100
=(101.5100)|100|×100=(101.5−100)|100|×100
=1.5100×100=1.5100×100
=0.015×100=0.015×100
=1.5%=1.5%
=1.5%error=1.5%error

Percent Error Calculator

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