Meet the Percentage Calculator
Work out any percentage problem instantly: what percentage one number is of another, what a percentage of a number is, or the percentage change between two values. Type your numbers into
- Free to use
- No signup
- Nothing to install
- Works in any modern browser
Your input
The actionA real example, step by step
Real data entered into the Percentage Calculator, one screenshot per step. Nothing is mocked up.
Open the tool
The Percentage Calculator opens ready to use, nothing to install or sign up for.
Enter your data
Real input used here: 20 20; 500 500.
Press Calculate All
The Percentage Calculator shows the result straight away, below the same form.
What is the Percentage Calculator?
Work out any percentage problem instantly: what percentage one number is of another, what a percentage of a number is, or the percentage change between two values. Type your numbers into the relevant fields and the result updates immediately, with the formula shown so you can see exactly how it was calculated.
This covers the three percentage questions people actually search for — 'X is what percent of Y', 'what is X% of Y', and 'percentage increase or decrease from X to Y' — in one page instead of three separate tools.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Percentage of a number, what-percent-is-X-of-Y, and percentage increase/decrease, all on one page.
No submit button — the answer updates as you type.
See the exact calculation, useful for homework and double-checking work.
Free to use as many times as you like, on any device.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Anyone doing quick math
Tips, splits, raises and markups without opening a spreadsheet.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This calculator | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
Questions people ask
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 80 = 80 × 15 ÷ 100 = 12.
How do I find what percent X is of Y?
Divide X by Y and multiply by 100. For example, 12 is what percent of 80? 12 ÷ 80 × 100 = 15%.
How is percentage increase or decrease calculated?
(New value − Original value) ÷ Original value × 100. A positive result is an increase, a negative result is a decrease.
Is this percentage calculator free?
Yes, completely free with no signup and no limit on calculations.
Does it work on mobile?
Yes, the layout is fully responsive for phones, tablets and desktops.
More free tools
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Try the Percentage Calculator now
Work out any percentage problem instantly: what percentage one number is of another, what. Free to use.
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