TheFreeTool

Percentage Calculator

Type two numbers and get five answers at once: a percent of a number, what percent one is of the other, the percent change, and the second number raised or lowered by the first as a percent.

What it does

  • A percent of a number, such as 15% of 200
  • What percent one number is of another
  • Percent change between two numbers
  • A number increased or decreased by a percent

How to use it

  1. Type the first number (A).
  2. Type the second number (B).
  3. Read all the answers below, with the wording filled in for your numbers.

How are percentages worked out?

A percent is a part out of 100. To find A percent of B, multiply B by A and divide by 100. So 15% of 200 is 200 × 15 ÷ 100 = 30.

To find what percent A is of B, divide A by B and multiply by 100. For percent change from A to B, take the difference B − A, divide by A and multiply by 100. To raise B by A percent, multiply B by 1 plus A ÷ 100.

Example

With A = 15 and B = 200: 15% of 200 is 30, 15 is 7.5% of 200, 200 increased by 15% is 230, and 200 decreased by 15% is 170. The change from 15 to 200 is +1,233.33%.

Questions people ask

How do I take a discount off a price?
Use the decreased-by answer. Put the discount percent as A and the price as B, for example 20 and 80 gives 64.
Why can percent change be over 100%?
Because the new number can be more than double the old one. Going from 15 to 200 is more than a twelve-fold increase.
What if A is zero?
Percent change from zero is undefined, so that answer shows a dash.

Disclaimer

This tool is for general information only. Results are provided as they are, with no guarantee that they are complete, accurate or right for your situation. You use this tool at your own risk, and TheFreeTool is not liable for any loss that follows. Read the full disclaimer

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