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Percentage Difference Calculator

Compare two values symmetrically when neither value is a designated starting point.

ResultThe percentage difference between 80 and 100 is 22.222222%.A symmetric comparison that gives the same answer whichever value comes first.

Calculations happen locally in your browser.

How to use this calculator

  1. Enter the two values to compare. Their order does not affect the result.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

The absolute difference is divided by the average magnitude of the two values, then multiplied by 100. Two zero values return 0% without dividing by zero.

Formula

Difference % = |first − second| ÷ ((|first| + |second|) ÷ 2) × 100

Step-by-step calculation

  1. Enter the two values to compare. Their order does not affect the result.
  2. The absolute difference is divided by the average magnitude of the two values, then multiplied by 100. Two zero values return 0% without dividing by zero.
  3. Check the displayed result, then copy it if needed.

Worked example

The percentage difference between 80 and 100 is about 22.22%.

Risk guidance

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Check that the entered units and values match your situation, especially around dates, breaks, and rounding.

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