Percentage difference calculator
Percentage difference has no "before" and "after". It divides by the average of the two, so it gives the same answer whichever order you enter them.
Percentage difference
40%
- Absolute difference
- 20
- Mean of the two
- 50
Show the working
- First value = 40
- Second value = 60
- Mean of the two = (40 + 60) / 2 = 50
- Absolute difference = abs(40 - 60) = 20
- Percentage difference = 50 != 0 ? 20 / abs(50) * 100 : 0 = 40
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- percentage difference = |a - b| / ((a + b)/2) x 100
Use percentage change when one value is a baseline; use percentage difference when neither is.