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Percentage difference calculator

Compare two nonnegative values without treating either one as the original. Calculate their absolute percentage difference.

Free · No signup · Processed in your browser

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How to use this calculator

  1. Enter values with a consistent currency and reporting period.
  2. Calculate to see the result and supporting figures.
  3. Review the formula and assumptions before using the result.

The formula, explained

|A − B| ÷ ((A + B) ÷ 2) × 100

Percentage difference uses the average of two values as its denominator, so swapping the values gives the same answer. The difference between 80 and 100 is about 22.22% of their average, 90.

Example inputs: first value 80; second value 100. Result: 22.2222 %.

What to check before using the result

Use percentage change when you have a before and after. Both inputs must be nonnegative and cannot both be zero. Different analytics counts can have different definitions, so a difference does not establish which tool is correct.

BEFORE YOU GO

Your work stays yours.

Are my files, text or numbers uploaded?
No. This tool processes the input in your browser tab. It does not send your input to our servers. Leaving or refreshing the page clears the working input.
Do I need an account or subscription?
No account is required for this public tool. You can complete the task and download the result directly. An account is useful when you want to measure visits to your own website or manage tracked campaign links.
Can I share or link to this tool?
Yes. Use the tool link below in a tutorial, team resource list or campaign checklist. The link opens an empty tool; your private input is not included.
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