Percentage Error Calculator
🔢 Number, percentages & ratio. Use the Percentage error formula to find percentage error, measured value, true value: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Percentage error | % |
| Measured value | no unit |
| True value | no unit |
Worked example
Find the percentage error when Measured value = 9.8, True value = 10.
Using \% error = (|measured - true|)/true × 100: Percentage error = 2 %.
Frequently asked questions
What is the formula for Percentage error?
\% error = (|measured - true|)/true × 100.
What do the letters stand for, and what units are used?
Percentage error in %, Measured value, True value.
How do you calculate percentage error?
Put the values into \% error = (|measured - true|)/true × 100. For example, with Measured value = 9.8, True value = 10, percentage error = 2 %.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (percentage error, measured value, true value) and fill in the others: it rearranges the formula for you.
