What is the Percentage Change Calculator?
Calculate the percentage increase or decrease from an old value to a new value.
Enter old value and new value and the Percentage Change Calculator returns percentage change, direction and difference. Results update as you type, and nothing you enter leaves your device.
How it is calculated
Change = (New − Old) ÷ |Old| × 100
How to use it
- Enter old value.
- Enter new value.
- Read percentage change 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 Change Calculator use?
It uses: Change = (New − Old) ÷ |Old| × 100.
What do I need to use the Percentage Change Calculator?
You need old value and new value. Sensible starting values are filled in so you can see how it works straight away.
Is the Percentage Change 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.