How is percentage difference calculated?

Percentage difference = |A − B| ÷ ((A + B) ÷ 2) × 100. It divides the absolute difference by the average of the two values, so neither number is treated as the reference.

How is this different from percentage change?

Percentage change uses a starting value as the reference (divides by the original number), while percentage difference divides by the average of both numbers and is always positive.

Is any data uploaded?

No — every calculation runs locally in your browser and nothing is sent to a server.

Percentage Difference Calculator

Percentage difference between two numbers

The percentage difference compares two values without treating either one as the reference point. It divides the absolute difference by the average of the two numbers:

percentage difference = |A − B| ÷ ((A + B) ÷ 2) × 100

Because it uses the average rather than a starting value, the result is the same whichever order you enter the numbers — and it is always positive. Use percentage change instead when one value is clearly the “before” and the other the “after”. Everything here runs in your browser.