Percentage Calculator
Find a percent of a number, what percent one number is of another, or the percentage change. Free, private and runs in your browser.
About Percentage Calculator
Percentage Calculator does three common jobs: it finds a percent of a number, works out what percent one number is of another, and shows the percentage change between two values. It is handy for discounts, taxes, tips, marks and price changes.
How to use Percentage Calculator
- Choose what to find: X% of Y, X is what % of Y, or % change from X to Y.
- Enter the two numbers.
- Click Calculate to see the result.
When is Percentage Calculator useful?
- Work out a discount on a price
- Calculate a tip or a service charge
- Find a share of a total
Frequently asked questions
What is the formula?
X% of Y is X ÷ 100 × Y. “X is what % of Y” is X ÷ Y × 100. Percentage change is (new − old) ÷ old × 100.
Can I use decimals?
Yes. Both fields accept decimal numbers.
Does it save what I type?
No. The calculation happens in your browser only.
Can I find a percentage increase or decrease?
Yes. Choose “% change from X to Y”, enter the old and the new value, and the tool shows the increase or decrease.
Is Percentage Calculator free to use?
Yes. Percentage Calculator is free, with no sign-up and no usage limits.
Is my data sent anywhere?
No. The work is done in your browser on your own device, so nothing you use here is sent to our servers.
Privacy and safety
Percentage Calculator runs entirely in your browser. What you enter never leaves your device and nothing is kept after you close the page.
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