Percentage calculator

Type a number and a percent without the % sign. The calculator computes (p ÷ 100) × n. 15% of 200 is 30, and 12.5% of 80 is 10. To compare an old value with a new one, open percentage change.

This tool answers: what is a given percent of a number? For example, 15% of 200 is 30. To compare an old and new value, use the percentage change calculator instead.

Input

Result

Enter the number and percent to see the result.

How does it work?

A percent of a number is a hundredths slice of the whole. “p% of n” is (p ÷ 100) × n. 15% of 200 is 0.15 × 200 = 30. 20% of 150 is 0.2 × 150 = 30. 12.5% of 80 is one eighth, so 10.

People open this calculator for a discount, VAT, or a share of a group. 15 of two hundred is an amount, not a year-to-year change. If an old salary is 5000 and the new one is 5750, that is percentage change: plus 15%, a different card with two value fields.

The form has two fields: Number and Percent (%). Type 200 and 15, click Calculate, and you get 30. You do not need a % in the second field. A comma and a period are the same, so 12.5 can be 12,5. A fractional or negative percent also works: minus 10% of 200 is −20.

You already know the percent and the number; you want the amount. There you hunt for p; here you already know p and n. A 3:2 ratio and the rule of three are separate: those scale pairs. Here you only take hundredths of one number.

Without Number or Percent, nothing computes. Typed 0 in Number gives 0, because zero times anything stays zero. The header money label stays out of the product. 15% of 200 is 30 in zloty or dollars.

10% of 80 is 8, 25% of 80 is 20, 50% of 200 is 100. Check the 15 and 200 example on the page before you copy the result into homework.

Formula

result = (p ÷ 100) × n

How to use

  1. Type the base in Number, for example 200.
  2. Type the percent in Percent (%), without a % sign. 15 means 15%.
  3. Click Calculate. 15% of 200 is 30, and 12.5% of 80 is 10.
  4. Type a fractional percent with a comma or a period. Minus 10% of 200 gives −20.
  5. Comparing old and new values lives on percentage change. This page stays with p% of n.

15% of 200 is 30

The calculator computes (p ÷ 100) × n. 15% of 200 is 30. 12.5% of 80 is 10.

% of
The fraction times the number. 15% of 200 = 0.15 × 200 = 30. 100% of 50 is 50. 0% of 120 is 0.
%
Percent without the sign in the field. Type 15, not 0.15. 12.5 on 80 gives 10, one eighth.

Examples

Example 1

  • Number: 200
  • Percent: 15

30

15% of 200 = 0.15 × 200 = 30 - e.g. a discount amount.

Example 2

  • Number: 80
  • Percent: 12.5

10

12.5% is one eighth - of 80 that gives 10.

Example 3

  • Number: 50
  • Percent: 100

50

100% of a number is the number itself.

Example 4

  • Number: 120
  • Percent: 0

0

0% of any number is zero.

Example 5

  • Number: 100
  • Percent: −10

−10

A negative percent yields a negative result - e.g. a downward adjustment.

Example 6

  • Number: 80
  • Percent: 15

12

What is 15% of 80? 12.

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Frequently asked questions

What is 15% of 200?

30. Compute 0.15 × 200. The same example sits on the page as a discount.

What is 12.5% of 80?

10. 12.5% is one eighth, so 80 ÷ 8 = 10 in this calculator.

Do I type a % next to 15?

No. Percent (%) already treats the value as hundredths. 15 means 15%.

How is this different from percentage change?

The calculator uses a slice of one number. Change needs old and new: 5000 to 5750 is plus 15% on that page.

What is 20% of 150?

30. 0.2 × 150 = 30, the same result as 15% of 200 from a different pair.

Does a negative percent work?

Yes. Minus 10% of 200 is −20. Same arithmetic, only p is negative.

What are 10% and 25% of 80?

10% of 80 is 8. 25% of 80 is 20. 50% of 200 is 100.

Is 30 of 200 the same question?

No. 30 of 200 asks “what percent”. Here you know the percent and the number, and you want the part.

Does a comma in 12.5 work?

Yes. 12.5 and 12,5 are the same percent. Both give 10 from 80.

Does the money label change 15% of 200?

No. 30 comes from the numbers. The header money label stays out of the formula.

Knowledge sources

The calculator computes the same formula as the definition below.

Page updated in 2026.