Convert tools

Percentage Calculator

Calculate a percentage of a number, one number as a percentage of another, or the percentage change from A to B.

Convert in your browser · No sign-up

Percentage change uses A as the starting value. A zero denominator is invalid. Decimal results are rounded to 13 significant digits.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

How to use

  1. Calculate a percentage of a number, one number as a percentage of another, or the percentage change from A to B.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

15% × 200 = 30

Details and limitations

Percentage change uses A as the starting value. A zero denominator is invalid. Decimal results are rounded to 13 significant digits.

Text stays in your browser; it is not sent to a conversion server.

FAQ

Percentage Calculator — What are the supported inputs and limits?

Percentage change uses A as the starting value. A zero denominator is invalid. Decimal results are rounded to 13 significant digits.

Format references

Tool page updated: