Percentage Difference Calculator
Not percent change from an old value, and not a sale markdown. Click any i for detail.
Two values
A
i
A
First number. Order does not matter. |
|
|---|---|
B
i
B
Second number. |
How to use this calculator
- Enter any two numbers.
- Read the symmetric % difference.
- Percent change from old → new is percentage increase.
- A shelf markdown is percent-off.
Results explained
|A − B| / ((|A| + |B|) / 2) × 100. Swapping A and B leaves the result unchanged.
Quick reference: three percents
80 vs 100 is 22.22% difference, 25% increase from 80, or 20% off 100.
| Item | Detail |
|---|---|
| This page | Symmetric difference |
| Percentage increase | (new−old)/|old| |
| Percent off | Sale markdown |
| z-score | SDs from a mean |
If both values are 0, the difference is undefined in this model (we show 0).
How the estimate is built
% diff = |A−B| / ((|A|+|B|)/2) × 100.
Example scenario
80 and 100 → |20| / 90 → 22.22%.
FAQ
Which is the baseline?
Neither — that’s why it is symmetric.
Negative numbers?
We use absolute values in the mean so the scale stays positive.
Statistics class mean?
Mean/median/mode is the list-stats page.