Percent error calculator
Published On: 02/03/2026
Percent Error Calculator
Compute percent error between an experimental (measured) value and a theoretical (accepted) value. This is commonly used in science labs, engineering, and measurement comparisons.
Inputs explained:
• Experimental value: your measured value from an experiment or observation.
• Theoretical value: the accepted/true/reference value you’re comparing against.
• Absolute vs signed: absolute percent error is always positive; signed shows whether you measured higher or lower.
• Experimental value: your measured value from an experiment or observation.
• Theoretical value: the accepted/true/reference value you’re comparing against.
• Absolute vs signed: absolute percent error is always positive; signed shows whether you measured higher or lower.
Percent Error Calculator — Description
The Percent Error Calculator measures how far an experimental (measured) value is from a theoretical (accepted) value. It uses the percent error formula: |experimental − theoretical| ÷ |theoretical| × 100 and outputs the result as a percentage. You can also switch to signed percent error to see whether your measurement is higher or lower than the reference.
This calculator is commonly used in chemistry, physics, engineering labs, and any situation where you compare measured results to a known standard.