Percentage Difference Calculator
Calculate the percentage difference between two numbers when neither is the obvious reference value.
What is the Percentage Difference Calculator?
Percentage difference compares two values symmetrically, dividing their absolute difference by their average. Use percentage change instead when one value is clearly the “before”.
How does it work?
The absolute difference is divided by the mean of the two values and multiplied by 100.
Formula
% difference = |A − B| ÷ ((A + B) ÷ 2) × 100
Example
Between 120 and 150, the difference is 30 and the average is 135, so the percentage difference is 22.22%.
Frequently asked questions
Why does the order of values not matter?
Because the formula uses the average of both values as the reference, the result is the same either way.
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