How Does This Calculator Work?
The calculator finds the absolute difference between the two values, divides it by their average, and multiplies by 100 — giving a difference that doesn't depend on which value is "first."
Unlike percentage increase/decrease, percentage difference treats both values symmetrically — useful when comparing two measurements or estimates rather than an "old vs. new" change.
Example Calculation
Comparison Example
Two price quotes: $40 and $50.
(|40-50|/((40+50)/2))×100 ≈ 22.2% difference.