Percentage difference calculator

Compare two values without choosing a baseline.

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First nonnegative value

Second nonnegative value

Answer

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Percentage difference = absolute difference ÷ average of the two values × 100.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

Neither value is a baseline; changing the order gives the same answer. Both zero is undefined. For before-and-after change, use percentage change.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

Check another calculation

Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

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Updated 2026-09-26

Using Percentage difference calculator

Percentage difference = absolute difference ÷ average of the two values × 100.

Neither value is a baseline; changing the order gives the same answer. Both zero is undefined. For before-and-after change, use percentage change.

Next: Percentage change calculator

A worked example

With first nonnegative value = 80, second nonnegative value = 100, the percentage difference (%) is 22.22222222222222.

Next: Percent error calculator

Before you use the result

Neither value is a baseline; changing the order gives the same answer. Both zero is undefined. For before-and-after change, use percentage change.

Example results for first nonnegative value

These examples use Second nonnegative value: 100. They are reference calculations, not recommended settings.

First nonnegative value	Percentage difference (%)
40	85.7142857143
80	22.2222222222
160	46.1538461538

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ToolOctopus. “Percentage difference calculator.” Updated 2026-09-26. https://tooloctopus.com/percentage-difference-calculator.

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