Percent Error Calculator

Calculate percentage error between an experimental (measured) value and the true (accepted) value.

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Experimental (Measured) Value

Theoretical (True/Accepted) Value

Results

Fill in your values above and click Calculate.

Frequently Asked Questions

Q.What is percent error?

Percent error measures how far a measured value is from the true value, as a percentage. Formula: |measured - true| / |true| × 100%.

Q.What is an acceptable percent error?

In most lab settings, below 5% is considered acceptable. Physics and chemistry experiments often aim for <1-2%.