X% of Y
Calculate what is X percent of a given number.
% of
Result
0.00
About the Percent of a Number Calculator
The Percent of a Number Calculator answers "what is X% of Y" — the formula behind discounts, tips, taxes, and commissions. For example, 15% of $240 is $36 — the tip on a $240 dinner, or the tax on a purchase.
Results update instantly as you type, with precise math underneath and sensible rounding on screen. Everything runs locally in your browser.
How to use it
- Enter your value in the input field.
- Select the units or values involved.
- Read the result — it updates as you type.
- Adjust any input to recalculate instantly.
Frequently asked questions
How is "X% of Y" calculated?
Multiply Y by X and divide by 100: 15% of 240 = 240 × 15 ÷ 100 = 36.
Does it work with decimals?
Yes — enter any real number; the calculation is precise and only the display is rounded.
Is anything sent to a server?
No. All calculations run locally in your browser.
Is it free to use?
Yes, completely free, with no limits and no account required.