Calculators
Calculate Percentage Difference
Use this free online percentage difference calculator to get instant results in your browser. No signup, no upload storage, and no server processing.
Direct Answer
The percentage difference compares two numbers by dividing their absolute difference by their average, then multiplying by 100. For 40 and 10, the difference is 30, the average is 25, so the percentage difference is 30 / 25 x 100 = 120%.
Percentage Difference Formula
Use this formula when neither number is the fixed starting value:
Percentage difference = |value 1 - value 2| / ((|value 1| + |value 2|) / 2) x 100
Example: 40 and 10
- Find the absolute difference:
|40 - 10| = 30 - Find the average of the two values:
(40 + 10) / 2 = 25 - Divide the difference by the average:
30 / 25 = 1.2 - Convert to percent:
1.2 x 100 = 120%
That is why 40 and 10 gives 120% as a percentage difference. If you want the percent change from 40 down to 10, use percentage decrease instead: (40 - 10) / 40 x 100 = 75%.
How to Use Percentage Difference Calculator
- Fill in the input fields with your values.
- The result calculates automatically as you type.
- For spreadsheet work, switch to Bulk paste and paste rows copied from Excel or Google Sheets.
- Copy the result column and paste it back into your spreadsheet.
- Use the Copy result button to copy the output to your clipboard.
- Press Reset to clear all fields and start again.
Formula Reference
| Feature | Details |
|---|---|
| Formula | |a - b| / ((|a| + |b|) / 2) x 100 |
| 40 and 10 | 30 / 25 x 100 = 120% |
| Use when | You want the relative difference between two values, not change from a starting value. |
| Use percent change instead when | One number is the original value and the other is the new value. |
| Category | Calculators |
| Works on | Desktop, tablet, and mobile browsers |
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Frequently Asked Questions
What is the Percentage Difference Calculator?
The Percentage Difference Calculator is a free online utility for everyday math, finance, date, and planning calculations. It calculates the answer from your values and shows the result directly on the page.
How do I use the Percentage Difference Calculator?
Enter the numbers or options requested by the form, then read the calculated result shown on the page.
Is the Percentage Difference Calculator free?
Yes. The Percentage Difference Calculator is free to use in your browser and does not require signup.
What makes the Percentage Difference Calculator on ToolsVillage different?
ToolsVillage calculator pages are built to put the calculation first: the inputs, result, formula context, and related calculators are kept close together without account prompts.
Can I use the Percentage Difference Calculator on mobile?
Yes. The page is mobile-friendly, so you can use the percentage difference calculator from a phone, tablet, laptop, or desktop browser.
Do I need to install anything to use this percentage difference calculator?
No installation is required. Open the page in a modern browser and use the tool directly online.
What is the fastest way to calculate percentage difference online?
Enter the numbers or options requested by the form, then read the calculated result shown on the page.
Can I copy the result from the Percentage Difference Calculator?
Yes. Where copying applies, the page includes a copy action so you can reuse the result quickly.