Percentage Calculator

Find a percentage of a number. Enter the value and the percentage rate below.

Result

Formula

Percentage result = number × percentage ÷ 100.

Example

15% of 200 = 200 × 15 ÷ 100 = 30.

Percentage Calculator: guide and examples

A percentage expresses a part per hundred. Use this calculator to find a percentage of a number, check a rate, or verify a quick calculation. First decide whether you need a portion of a value or a percentage change between two values; these are different operations.

Formula

Percentage of a value = value × percentage ÷ 100. For example, 15% of 200 is 30. Percentage change = (new value − original value) ÷ original value × 100.

How to use it

  1. Enter the base number.
  2. Enter the percentage rate.
  3. Calculate and compare the output with the formula above.

Common mistakes

Do not divide by 100 twice, mix up the base and rate, or confuse a percentage-point difference with a percent change. For money or reporting, keep the rounding rule consistent.

Frequently asked questions

What is 15% of 200? It is 30. Can I calculate a percentage increase? Yes, but compare the original and new values using the percentage-change formula.