How to calculate percentage change
- Choose 'Percent change' if it is not already selected.
- Type the old value and the new value.
- Read the percent change and the working.
About this tool
Percentage change tells you how big a rise or fall is compared with where you started. Enter the old value and the new value. The result is positive for an increase and negative for a decrease, with the amount of change shown beside it. The same page also answers the other common percent questions.
Common questions
What is the formula for percentage change?
(new value - old value) / old value x 100. A positive result is an increase and a negative one is a decrease.
Why can't I use 0 as the old value?
A change from 0 cannot be written as a percent, because it would mean dividing by 0. Use a different starting value.
Is a 50% rise followed by a 50% fall the same as no change?
No. 100 rises to 150, then 50% of 150 is 75, so you end at 75, which is 25% lower than the start.
Is it free to use?
Yes. There's no sign-up, and you can use it as often as you like.
Is my text uploaded anywhere?
No. This tool runs inside your browser, so what you enter stays on your device.
Do I need to install anything?
No. It works in your browser on a computer or a phone.