Percentage Calculator
Work out any percentage.
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About Percentage Calculator
The Percentage Calculator handles the three questions you actually ask: what is X% of Y, X is what percent of Y, and the percentage change from one value to another. Every answer updates live as you type, with a plus or minus sign on increases and decreases.
It is completely free and runs entirely in your browser. Nothing you enter is uploaded or stored, there are no accounts or limits, and it works on desktop and mobile alike.
Frequently asked questions
- Is the percentage calculator free to use?
- Yes, it is completely free with no sign-up, no limits, and no ads blocking the tool.
- Is my data uploaded anywhere?
- No. All calculations run entirely in your browser, so the numbers you enter never leave your device.
- How do I calculate what X% of Y is?
- Enter the percentage in the first field and the base value in the second; the result appears instantly, for example 15% of 200 is 30.
- How do I find what percentage one number is of another?
- Use the second section: enter the part and the whole, and it shows the part as a percentage, such as 30 out of 120 being 25%.
- How is percentage change calculated?
- It subtracts the starting value from the ending value, divides by the starting value, and multiplies by 100, showing a plus sign for an increase or a minus sign for a decrease.
- Does it work on mobile?
- Yes. The layout is responsive and the number inputs bring up a numeric keypad on phones and tablets.