Percentage Change Calculator
Compare two numbers and see exactly how much one has changed relative to the other. Enter an old value and a new value, and the calculator returns the percentage change, telling you clearly whether it is an increase or a decrease, along with the raw difference between the two figures. This is the calculation behind price changes, revenue growth, population shifts, test-score improvements and countless everyday comparisons, and it is easy to get backwards when done by hand. The percentage is always measured against the original value, which is the correct convention. Enter your two numbers and the answer appears instantly, with the sign making the direction unmistakable. Everything is computed locally in your browser and nothing is stored.
How to use Percentage Change Calculator
- Enter the original value.
- Enter the new value.
- Read the percent increase or decrease and the difference.
Frequently asked questions
How is percentage change calculated?
It is the new value minus the old value, divided by the old value, times 100. A positive result is an increase and a negative one is a decrease.
What is the difference between change and difference?
The absolute difference is simply new minus old. The percentage change puts that difference in proportion to the original value.
Why does direction matter?
Going from 100 to 150 is a 50 percent increase, but 150 back to 100 is only a 33 percent decrease, so the base value you divide by matters.
What is Percentage Change Calculator?
Compare two numbers and see exactly how much one has changed relative to the other. Enter an old value and a new value, and the calculator returns the percentage change, telling you clearly whether it is an increase or a decrease, along with the raw difference between the two figures.
Is Percentage Change Calculator free to use?
Yes. Percentage Change Calculator is completely free, with no sign-up and no usage limits.
Does Percentage Change Calculator work in a web browser?
Yes. Percentage Change Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Percentage Change Calculator?
Yes. Percentage Change Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/percentage-change-calculator)