Enter the accepted value and the measured value; the percent error updates as you type.
Percent Error Calculator Online
Enter the accepted (theoretical) value and the measured (experimental) value; the percent error, the absolute error, and whether the measurement ran high or low update as you type.
Use it for a lab measurement against a known reference value, a manufacturing tolerance check, or comparing an estimate against the actual result.
The calculation runs locally in the browser - no upload and no account.
Frequently Asked Questions
What does Percent Error Calculator Online do?
Enter the accepted (theoretical) value and the measured (experimental) value and it works out the percent error, the absolute error, and whether the measured value ran high or low.
When should I reach for percent error calculator online?
Use it for a lab measurement against a known reference value, a manufacturing tolerance check, or comparing an estimate against the actual result.
What complementary tools work well alongside percent error calculator online?
Looking for a plain percentage instead - X% of Y, what percent one number is of another, or a percent change? Use the percentage calculator for that; this tool is specifically for comparing a measured value against an accepted value.