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Percentage, Discount and Increase Calculator

Four calculators in one page cover the most common percentage problems: what a percentage of a number is, what percentage one number is of another, the percent change between two values, and adding or subtracting a percentage from an amount such as tax or a product discount. Type the numbers and the result appears directly.

This tool runs entirely in your browser, and what you type is never sent to a server.

How to use

  1. Pick the calculator that fits your problem from the four.
  2. Type the two required values.
  3. Read the result that appears under the two fields.

Examples

If a product costs 800 and has a 15% discount, use the last calculator to get the price after discount. If your salary rose from 6000 to 6600, use the change calculator to see it is a 10% rise. If you answered 42 questions correctly out of 50, use the second calculator to get your percentage.

A common mistake

A 20% discount followed by a 20% increase does not return the price to its original, because the increase is calculated on the price after the discount, not on the original. So calculate each step on its own.

Frequently asked questions

Can I use decimals?

Yes, use a decimal point such as 12.5. Arabic-Indic digits are accepted as well.

Why can't I enter zero?

In some calculators zero leads to division by zero, and a message explains this.

Are results rounded?

Up to four decimal places are shown, and add and subtract results are rounded to two.

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