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Percentage Difference Calculator
Symmetric difference — no "old" or "new", just two values.
Enter values to see your result
Frequently asked questions
% difference vs % change?
% change: uses old value as reference (directional). % difference: uses average (symmetric). Different numbers usually.
When to use each?
% change when one value is clearly "before"/"old". % difference when comparing two equally valid measurements.
Always positive?
Yes — uses absolute value. For direction, use % change instead.
Why not just average?
Dividing by the larger makes small differences look smaller. Averaging is neutral.