Percent Error Calculator
Calculate absolute percent error relative to a reference.
Open toolPercent Difference Calculator
Calculate symmetric percent difference using the two-value average. Nonnegative values only; at least one must be positive.
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 Difference Calculator works
Calculate symmetric percent difference using the two-value average.
Nonnegative values only; at least one must be positive. Uses |a − b| / ((a + b) / 2) × 100. This is distinct from directed percent change. Finite real numbers only. Display uses up to 12 significant digits; binary floating-point arithmetic can introduce rounding.
How to use Percent Difference Calculator
Follow the labelled inputs.
Enter first nonnegative value
Replace the example with first nonnegative value. The field labels specify the expected format and units.
Input and settings
Check the remaining inputs
Set second nonnegative value. Nonnegative values only; at least one must be positive.
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 Difference Calculator
Check the supplied example
The starting example produces 22.2222222222%. Calculate symmetric percent difference using the two-value average.
Use your own inputs
Read the labels for first nonnegative value and second nonnegative value. Nonnegative values only; at least one must be positive.
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 symmetric percent difference using the two-value average.
Nonnegative values only; at least one must be positive. Uses |a − b| / ((a + b) / 2) × 100. This is distinct from directed percent change. 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.
Nonnegative values only; at least one must be positive. Uses |a − b| / ((a + b) / 2) × 100. This is distinct from directed percent change. 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 Difference Calculator: common questions
Answers about using Percent Difference Calculator and understanding its results.
Which inputs does this tool accept?
Nonnegative values only; at least one must be positive. Uses |a − b| / ((a + b) / 2) × 100. This is distinct from directed percent change. 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.