# How to find a Percentage of a Number

**How to find a percentage** is a very recurring question. This page explains a method to figure out the percentage of a number when using a calculator that is missing the percent key.

### What is a percentage?

A percentage is a proportion between two quantities expressed in hundredths. It is often used to define a portion as a fraction of a whole. It's widely used in statistics, and finance to define probability, rate of return etc.

### How to find a percentage of a number

Multiply the number by the percentage fraction. For example to calculate 9% of 25000, multiply 25000 by 9/100, that is, multiply 25000 by 0.09.

### How to add or subtract percentages

If your calculator does not have a **percent key** and you want to **add** a percentage to a number **multiply** that number by 1 **plus** the percentage fraction. For example 25000+9% = 25000 x 1.09 = 27250. To **subtract** 9 percent multiply the number by 1 **minus** the percentage fraction. Example: 25000 - 9% = 25000 x 0.91 = 22750.

### Try it out online

Try a virtual calculator by selecting a simple or a paper roll calculator from the icons below. **Just click on the calculator of your choice.** Alternatively, you can try Alcula's percentage calculator.