Percentage change vs percentage difference
They sound the same. They aren't. Use change for before-and-after; use difference when neither value is the 'baseline'.
3 min readReviewed Apr 1, 2026
Quick answer
Use percentage change when one value comes before the other. Use percentage difference when you're just comparing two values without a clear baseline.
The key difference
Percentage change
- Has a clear 'before' and 'after'.
- Formula: (new − old) ÷ old × 100.
- Result direction matters (up vs down).
- Used for growth, inflation, returns.
Percentage difference
- No baseline — both values are equal in standing.
- Formula: |A − B| ÷ ((A + B)/2) × 100.
- Result is always positive.
- Used to compare measurements or experiments.