Percent Error Calculator

Percent error between an experimental and theoretical value.

Percent Error Calculator helps you percent error between an experimental and theoretical value. Enter measured value (experimental) and expected value (theoretical), review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Percent Error calculator does Percent Error Calculator is built for arithmetic, algebra, geometry, and number tools. Percent error between an experimental and theoretical value. You enter measured value (experimental) and expected value (theoretical), then Simple Calculators computes the result instantly. Results use standard school and engineering formulas that run privately in your browser. How the math works Enter the Measured value (experimental) and the Expected value (theoretical) in the same unit. The calculator takes the difference, ignores whether it is positive or negative, divides by the size of the expected value and multiplies by 100: % error = |measured − expected| ÷ |expected| × 100. It also shows whether your measurement was high or low, an accuracy figure (100 − % error) and a rough quality rating. The expected value cannot be zero. The formula: % error = |measured − expected| ÷ |expect…