Percentage calculator
Work out X% of a number, what percent one number is of another, the percent increase or decrease, and the price after a discount, as you type.
How to calculate a percentage
- Pick the box that matches your question, e.g. "What is 10% of 250?".
- Type the two numbers. Decimals can use a dot (12.5) or a comma (12,5).
- The answer appears right away. Use the copy icon to paste it elsewhere.
Frequently asked questions
X% of Y = Y × X ÷ 100. A as a percent of B = A ÷ B × 100. Percent change = (new value − old value) ÷ old value × 100.
Use "Increase / decrease by a percent": enter the original price and 20. The "decreased" line is the sale price, e.g. 50 minus 20% is 40.
No. 100 up 10% is 110, and 10% off 110 leaves 99. The decrease is taken from the bigger number, so it removes more than was added.
Asking what percent something is of 0, or the percent change starting from 0, has no answer. Check the numbers you entered.
Yes. 1,000,000 and 1000000 work the same. Use a dot for decimals, e.g. 12.5.
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