Percentage Calculator
Calculate percentages, percent changes and proportions quickly.
About this tool
The Percentage Calculator solves the three most common percentage calculations in a single interface, without needing to remember formulas: how much is X% of a value, what percentage one number represents of another, and what the percentage change is between two values.
To use it, choose the type of calculation you need using the available tabs, fill in the two input fields, and the result appears automatically. There is no calculate button — the answer is displayed as you type.
Everyday use cases are broad: calculating the value of a discount on a purchase, figuring out how much a commission amounts to as a percentage of sales, checking the percentage increase in a salary, understanding what share a payment represents in the total cost of a loan, calculating product markup for pricing, or verifying whether the price change of an item really was the advertised 10%. Finance, retail, and management professionals use this type of calculation repeatedly throughout the day.
The tool runs entirely in the browser with no data transmission and no account required. It is free and works on both desktops and mobile devices.
Frequently asked questions
Is the percentage calculator free?
Yes, completely free.
Are the values I enter sent to any server?
No. All calculations are performed locally in your browser.
Does it work on mobile?
Yes. The layout is responsive and works on any device.
What types of calculations are available?
Three: (1) X% of a value, (2) what percentage A is of B, and (3) percentage change between two values.
Can I calculate a percentage increase or discount?
Yes. Use the percentage change mode: enter the original value as 'from' and the new value as 'to'. A positive result means increase; negative means decrease.