Percent Difference Calculator

Percent difference calculator: the relative difference between two values compared with their average, plus the percent change in each direction.

% diff = |a − b|(a + b) / 2 × 100

How to use this calculator

  1. Type your input in the box.
  2. The result updates as you type.
  3. Use “Copy result” or “Copy link” to share it.

Percent difference = |a − b| ÷ ((a + b)/2) × 100. Use it when neither value is the reference; use percent change when one is the starting point.

Frequently asked questions

40 and 50?

22.22 % difference; +25 % from 40 to 50, −20 % from 50 to 40.

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