justyourcalculatorPercent Error Calculator
Compare a measured value with the accepted value and see the percent error.
- 100% Free
- Instant Results
- No Sign Up
Percent Error Calculator
How far a measured value is from the true value
Percent error
2.140673%
The measurement is below the true value.
- Absolute error |observed - true|
- 0.21
- Signed error (observed - true)
- -0.21
- Relative error
- 0.02140673
- Signed percent error
- -2.140673%
How it was calculated
- Percent error = |observed - true| / |true| × 100
- = |9.6 - 9.81| / |9.81| × 100
- = 0.21 / 9.81 × 100
- = 0.02140673 × 100 = 2.140673%
More Math Calculators
View all calculators- Percentage CalculatorPercent of, percent change and more
- Rounding CalculatorRound to decimals, places or significant figures
- Average CalculatorMean, weighted average and more
- Standard Deviation CalculatorPopulation or sample standard deviation with steps
- Scientific CalculatorTrig, logs, powers, roots and memory in one keypad
- Fraction CalculatorAdd, subtract, multiply and divide fractions
- Triangle CalculatorSolve any triangle from three known values
- Random Number GeneratorRandom integers or decimals in any range
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 with exact roots
- Calculators
- 204+
- Free to use
- 100%
- Results as you type
- Instant
How the percent error calculator works
Percent error tells you how far a measured or estimated value is from the true or accepted value, as a percentage of the true value: |observed - true| / |true| × 100.
Most science classes use the absolute value, so percent error is never negative. The signed version keeps the sign, which tells you whether your measurement was too high (positive) or too low (negative).
Using and checking your result
Published by JustYourCalculator. Check the units and assumptions above, and compare a known example before relying on the output. Calculations use browser arithmetic and may round displayed values.
Share links may contain your input values. Anyone with the URL can read them; avoid sharing sensitive personal or financial information.