Percentage calculator
Work out percentages, percentage change and increases instantly, right in your browser.
Files are processed in your browser and never uploaded.
How to use Percentage calculator
Enter your figures
Fill in Text (a2), Text (b1), Text (b2) and Text (c1). Values you change are used straight away, with no submit button.
Adjust the assumptions
Fine-tune Text (c2), Text (d1) and Text (d2) to match your own situation.
Read the results
The totals and the breakdown below them update as soon as a value changes.
What this tool does
Percent of a number
What is X percent of Y, answered as you type, which is the discount, the tip and the tax question in one box.
What percent one number is of another
X is what percent of Y, for working out a share, a pass mark or a proportion of a total.
Percentage change between values
The percentage change from one value to another, with the sign showing whether it went up or down.
Increase a number by a percent
Increase or decrease a number by a percentage, which is the one people most often get backwards doing it by hand.
Live, works offline
Every box updates live, and the whole thing runs in your browser with nothing uploaded.
Frequently asked questions
Is anything uploaded?
No. All percentage calculations run live in your browser with nothing uploaded, and it works offline.
What can it work out?
The percent of a number, what percentage one number is of another, the percentage change between two numbers, and increasing a number by a percentage.
How is percentage change calculated?
As the difference between the two values divided by the original value, times 100. A positive result is an increase and a negative result is a decrease.
Can I use decimals?
Yes. Enter any decimal values and the results update instantly.
Does it work on mobile?
Yes. It is fully responsive and works in any modern mobile browser.
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