Percentage is a free math & calculators tool that runs entirely in your browser — change, of-total, tip & discount. No upload, no account, no limits.
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How to use Percentage
Open the Percentage tool.
Paste or type your number into the input field.
The output updates as you type — adjust the options if you need a different format.
Copy the result, or share the URL to hand the exact input to someone else.
About Percentage
Solve the three everyday percentage questions at once: what is A% of B, C is what percent of D, and the percentage change from one value to another. Type the numbers and all answers update live.
What people use it for
Work out a tip, discount or tax as a percentage of a total.
Find what percentage one number is of another.
Calculate percentage increase or decrease between two figures.
Frequently asked questions
What can it calculate?
Percent-of-a-number, one number as a percent of another, and percentage change (increase/decrease) — simultaneously.
Is it private?
Every calculation happens on this page, in your own browser. Your input is never sent to a server, never logged and never used for training — which also means the tool keeps working when you are offline.