Percent Difference Calculator
Calculate symmetric percent difference using the two-value average.
Open toolPercent Error Calculator
Calculate absolute percent error relative to a reference. Reference must be nonzero.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate result.
Your result
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Result will appear here
How Percent Error Calculator works
Calculate absolute percent error relative to a reference.
Reference must be nonzero. Uses absolute difference divided by the absolute reference; it does not use the average of both values. Finite real numbers only. Display uses up to 12 significant digits; binary floating-point arithmetic can introduce rounding.
How to use Percent Error Calculator
Follow the labelled inputs.
Enter observed value
Replace the example with observed value. The field labels specify the expected format and units.
Input and settings
Tool result
Run, review and save
Select Calculate result. Review the calculated result, then copy it or download the result text.
Review the details
Examples and uses for Percent Error Calculator
Check the supplied example
The starting example produces 5%. Calculate absolute percent error relative to a reference.
Use your own inputs
Read the labels for observed value and nonzero reference value. Reference must be nonzero.
Record a reviewed result
Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.
How to read the result
Read the units and assumptions with the output.
Calculate absolute percent error relative to a reference.
Reference must be nonzero. Uses absolute difference divided by the absolute reference; it does not use the average of both values. Finite real numbers only. Display uses up to 12 significant digits; binary floating-point arithmetic can introduce rounding.
Supported input and limits
Check the stated scope before you run it.
Reference must be nonzero. Uses absolute difference divided by the absolute reference; it does not use the average of both values. Finite real numbers only. Display uses up to 12 significant digits; binary floating-point arithmetic can introduce rounding.
The input stays in this browser. Copy result and Download save the same displayed text.
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Open toolPercent Error Calculator: common questions
Answers about using Percent Error Calculator and understanding its results.
Which inputs does this tool accept?
Reference must be nonzero. Uses absolute difference divided by the absolute reference; it does not use the average of both values. Finite real numbers only. Display uses up to 12 significant digits; binary floating-point arithmetic can introduce rounding.
Can I copy or download the result?
Yes. Copy result copies the displayed text, and Download saves the same result as a text file. Calculations run in your browser without an account.
Calculate result with your input
Check the calculated result, then copy or download it.