Percent error and absolute error calculator
Compare a measured value with the accepted value to calculate absolute error and percent error against the correct reference.
percent error and absolute error calculator: Calculate absolute and percent error against the accepted value.
[cep_percent_tool lang="en" context="error" mode="ratio" a="245" b="250"]
How to calculate it
Find the absolute difference between measured and accepted values, divide by the absolute accepted value, and multiply by 100.
- Insert the values in the formula, perform the division first, and round only the final answer.
- Percent error is undefined when the accepted value is zero.
Applied example
If the measured value is 245 and the accepted value is 250, absolute error is 5 and percent error is 2%.
Find the absolute difference between measured and accepted values, divide by the absolute accepted value, and multiply by 100. Percent error is undefined when the accepted value is zero.
Practical use
Compare measurement error with the accepted reference value.
For relative error and accuracy, use “true or reference value” as the reference. It must represent the full set or the starting point of the comparison.
Checks that matter
- The denominator is the reference value; relative error is undefined when it is zero.
- Do not swap the part and total; reversing them changes the meaning of the result.
- Keep full precision during the calculation and round only the final answer to match the accuracy of the source data.
Frequently asked questions
What is the correct reference value?
For relative error and accuracy, use “true or reference value” as the reference. It must represent the full set or the starting point of the comparison.
Can the answer be greater than 100%?
Yes. This happens when the part exceeds the total or the final value is more than double the starting value.
How many decimal places should I use?
Keep full precision during the calculation and round only the final answer to match the accuracy of the source data.