What is the Percentage Difference Calculator?
Find the percentage difference between two values, relative to their average.
Enter first value and second value and the Percentage Difference Calculator returns percentage difference and absolute difference. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Difference = |a − b| ÷ ((a + b) ÷ 2) × 100
How to use it
- Enter first value.
- Enter second value.
- Read percentage difference in the results panel. It updates as you type.
- Change any value to compare scenarios, or use Share to send the result as a link.
Worked example
Common questions
What formula does the Percentage Difference Calculator use?
It uses: Difference = |a − b| ÷ ((a + b) ÷ 2) × 100.
What do I need to use the Percentage Difference Calculator?
You need first value and second value. Sensible starting values are filled in so you can see how it works straight away.
Is the Percentage Difference Calculator free, and is my data stored?
It is free with no sign-up. The calculation runs in your browser, so the values you enter are not sent to or stored on our server.