Percentage Difference Calculator
Fill in the values and the answer updates as you type.
How the Percentage Difference Calculator works
Percentage difference = |a − b| ÷ ((a + b) ÷ 2) × 100. Unlike percentage change, it treats both values equally. Use percentage change when one value is clearly the starting point.
Inputs and results
The Percentage Difference Calculator takes 2 inputs and gives 3 results.
What you enter
- First value — starts at 80.
- Second value — starts at 120.
What you get
- Percentage difference
- Absolute difference
- Average of the two
Example: Percentage Difference Calculator with the starting values
With first value 80 and second value 120, the calculator returns:
| Percentage difference | 40% |
|---|---|
| Absolute difference | 40 |
| Average of the two | 100 |
Change any value above and the results update straight away.
Percentage Difference Calculator FAQ
How do I use the Percentage Difference Calculator?
Enter first value and second value in the fields, then read percentage difference, absolute difference and average of the two in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Percentage Difference Calculator calculate?
Percent difference between two values, regardless of order. It returns percentage difference, absolute difference and average of the two from the 2 values you provide.
What values does the Percentage Difference Calculator start with?
It opens with first value 80 and second value 120 so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Percentage Difference Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Percentage Difference Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.