Use percentage difference to compare two prices, measurements or products where neither is the “original”.
How to use the Percentage Difference Calculator
- Value A
- Value B
Results update as you type, and every field accepts the units shown in its menu.
How it works
Take the absolute difference and divide by the mean of the two values.
Inputs explained
| Field | What to enter |
|---|---|
| Value A | A number |
| Value B | A number |
What each result means
- Percentage difference = abs([Value A] – [Value B])÷(([Value A] + [Value B])÷2) × 100
- Change from A to B = ([Value B] – [Value A])÷[Value A] × 100
Example values
How the main result changes when Value A changes and everything else stays at the example values above:
| Value A | Percentage difference (%) |
|---|---|
| 60 | 85.7143 |
| 90 | 50 |
| 120 | 22.2222 |
| 150 | 0 |
| 180 | 18.1818 |
| 240 | 46.1538 |
Formula
% difference = |a − b| ÷ ((a + b) ÷ 2) × 100Worked example
Inputs — Value A: 120; Value B: 150.
Results — Percentage difference = 22.2222 %; Change from A to B = 25 %.
Frequently asked questions
How is this different from percentage change?
Percentage change uses the original as the base; percentage difference uses the average.
Why do I get different answers from other tools?
Some sites mean percentage change when they say difference.
What formula does the Percentage Difference Calculator use?
% difference = |a − b| ÷ ((a + b) ÷ 2) × 100.