A percentage calculator helps you find what one percentage of a number equals. It is useful for discounts, marks, price changes, tax, commissions, and everyday number comparisons.
Use the calculator first, then read the guide below to understand the formula and examples.
Direct answer
To use a percentage calculator, enter the percentage in the first box and the number in the second box. The calculator multiplies the number by the percentage divided by 100.
Formula
The basic formula is: result = percentage ÷ 100 × number. For example, 20% of 250 is calculated as 20 ÷ 100 × 250 = 50.
When this is useful
This calculation is useful when you want to know a discount amount, tax amount, percentage of marks, a partial amount, or a share of a total.
Common mistake
A common mistake is entering the full number as the percentage. For example, if you want 20% of 250, the percentage field should be 20, not 0.20 or 250.
Example
If a product costs 250 and you want to find 20% of it, the answer is 50. If that is a discount, the final price would be 250 - 50 = 200.
FAQs
What does percentage mean?
A percentage is a number out of 100. So 20% means 20 out of every 100.
Can I use the same calculator for discounts?
Yes. First calculate the discount amount, then subtract it from the original price.
Is 50% the same as half?
Yes. 50% of a number is the same as half of that number.