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Percentage Difference Calculator

Compare two nonnegative values without choosing a baseline.

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Formula / Calculation Method

Difference % = |A − B| / ((A + B)/2) × 100.

Example Calculation

80 and 100 have a percentage difference of 22.22%.

Understanding the Result

At least one value must be greater than zero. This symmetric comparison differs from percentage change.

What is the Percentage Difference Calculator?

Compare two nonnegative values without choosing a baseline.

How to Use

Enter two nonnegative measurements in the same units. At least one must be positive.

Select Calculate after entering your values. Text tools update as you type. Reset restores the starting fields.

Interpreting the Calculation

This comparison uses the average of both values as the baseline, so swapping them leaves the result unchanged. It is useful when neither measurement is naturally the starting value.

Common Questions

Is this the same as percentage increase?

No. Percentage increase uses the original value as its denominator, while percentage difference uses the mean of the two values.

What assumptions does this tool use?

At least one value must be greater than zero. This symmetric comparison differs from percentage change.

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