A percentage error calculator measures how far an experimental or measured value deviates from the true or theoretical value, expressed as a percentage.
About this calculator
A percentage error calculator measures how far an experimental or measured value deviates from the true or theoretical value, expressed as a percentage. It is a standard tool in science labs, engineering, and quality control to assess measurement accuracy.
Percentage Error = |Experimental − Theoretical| / |Theoretical| × 100%
Common uses
- Calculate measurement error in a physics experiment
- Assess the accuracy of a manufactured part vs specification
- Compare experimental results to known theoretical values
- Evaluate sensor or instrument accuracy
Frequently asked questions
What is an acceptable percentage error?
It depends on the application. In undergraduate physics labs, 5–10% error is often acceptable. In precision manufacturing, errors below 0.1–1% are required. In clinical measurements, acceptable error varies by test. Always compare against the standard for your specific field.