How to Use Percentage Calculator
A quick, all-in-one percentage calculator: find a percentage of a number, work out what percent one number is of another, and compute the percentage increase or decrease between two values.
Open the Percentage Calculator tool →What is Percentage Calculator?
Work out percentages three ways: X% of Y, X is what % of Y, and percentage change. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Percentage Calculator
- Open the Percentage Calculator tool.
- Enter your values or options.
- The result updates instantly as you type.
- Use or copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
What can it work out?
Three common calculations: X% of Y, X is what percent of Y, and the percentage change from one number to another.
How is percentage change calculated?
As the difference divided by the original value, so a rise from 50 to 75 is a 50% increase.
Is my data uploaded?
No — it's calculated locally in your browser.
Ready to try it?
Open Percentage Calculator →