Percentage Difference Calculator
Percentage Difference Calculator: free, instant and private. Percentage difference compares two values with neither treated as the starting point, and it is not the same as percentage change.
How the Percentage Difference Calculator works
The Percentage Difference Calculator takes Value A, Value B and returns the answer instantly — no button to hunt for, no page reload. Percentage difference compares two values with neither treated as the starting point, and it is not the same as percentage change. Use it for comparing two readings, prices or measurements side by side.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
difference % = |A − B| ÷ ((A + B) ÷ 2) × 100
| Symbol | Meaning |
|---|---|
| A, B | the two values being compared |
Percentage difference compares two values with neither treated as the starting point, and it is not the same as percentage change. Use it for comparing two readings, prices or measurements side by side.
Inputs used: Value A, Value B.
Worked example
Take the default example — value a of 120, value b of 150:
- Percentage difference: 22.22
Frequently asked questions
- What formula does the Percentage Difference Calculator use?
- It uses difference % = |A − B| ÷ ((A + B) ÷ 2) × 100, where A, B is the the two values being compared.
- Is the Percentage Difference Calculator free?
- Yes. There is no signup, no usage limit and no watermark — the calculator runs entirely in your browser.
- How do I read the result?
- Percentage difference compares two values with neither treated as the starting point, and it is not the same as percentage change. Use it for comparing two readings, prices or measurements side by side.
- Does the Percentage Difference Calculator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.