What does the Percent Error Calculator work out?

How far an estimate sits from the true value. It is one of the Math tools on Mondo Knows.

How is the Percent Error Calculator calculated?

The maths is short enough to check by hand: Percent error = |experimental - theoretical| / |theoretical| x 100.

Do I need to sign up, and is my data stored?

No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

Mondo Knows Tools

Percent Error Calculator

How far an estimate sits from the true value. Use the free percent error calculator below to get an instant answer, with the formula shown so you can check the maths and trust the result. Free, private, and no sign-up.

Observed value

True value

Mondo says

Percent error

2.000%

Absolute error0.2

DirectionUnderestimate

The formula

Percent error = |experimental - theoretical| / |theoretical| x 100

Percent Error Calculator: common questions

What does the Percent Error Calculator work out?: How far an estimate sits from the true value. It is one of the Math tools on Mondo Knows.
How is the Percent Error Calculator calculated?: The maths is short enough to check by hand: Percent error = |experimental - theoretical| / |theoretical| x 100.
Do I need to sign up, and is my data stored?: No sign-up, and nothing you type is sent anywhere. The calculation runs in your own browser, so the figures stay on your device and the page works offline once loaded.

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Estimates for general guidance only. This is not financial, medical or legal advice. Everything runs in your browser and nothing you type is stored.