Percentage Difference Calculator
How different are two numbers, in percent? Neither is treated as the reference.
—Percentage difference
—Change A → B
—Change B → A
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How it works
Percentage difference = |A − B| ÷ ((A + B) ÷ 2) × 100. It compares both values to their average, so swapping them gives the same result — useful when neither value is the “original” (two prices, two measurements). Percentage change, in contrast, depends on the direction: 40 → 60 is +50%, but 60 → 40 is −33.3%.