Online Percentage Calculator

A free Web tool used to determine percentages is called the percentage calculator.

What is % of ?
is what percent of ?
What is the percentage increase/decrease
from to ?


Tip: The tab key will advance you to the next field. The shift-tab key lets you go back to the previous field. To calculate, tap the enter key.

How to Use a Percentage Calculator

To start, select the calculator you want from the above three types. Next, put your first number in the box on the left. To enter your second number in the box at the centre of the table, tab or click to move to the next field. Finally, just click the "Calculate" button. You will see your answer in the box on the right.

What You Need to Know to Get Started

JavaScript support must be enabled in your browser to use the Percentage Calculator.

Moving Between Fields

Mouse: position your mouse and then click on the field.
Keyboard: Tab to advance to the next field. The shift-tab keys take you back to the previous field.

How to Perform a Calculation

Mouse: position your mouse and click on the "Calculate" button.
Keyboard: Tap the enter button.

You'll see the percentage on the right in the text field. When are error occurs, you'll see the answer field empty, but the background will have errors in red.

Decimal separator

A dot (.) or a comma (,) can be employed as a decimal separator.

Thousands separator

Warning: avoid using the thousands separator since the Percentage Calculator is set up to use them as decimal separators.

Read More: Definitions...


Percent is defined as a specified amount in one hundred parts or "per 100."
It is applied when describing a part or piece of a whole. It's derived from per cent which is an abbreviation for per centum or per one hundred.
% is the percentage symbol.
1 percent (1%) = 1 portion per 100 = 1/100 = 0.01 (a part less than the whole)
100 percent (100%) = 100 portions per 100 = 100/100 = 1 (a part equal to the whole)
110 percent (110%) = 110 parts per 100 = 110/100 = 1.1 (a part more than the whole)


A portion per 100 that applies to a part of the whole (in common usage) usually without referring to a particular amount.

Percent vs. Percentage:

Percent is usually used with a number (example: 20 percent) while the word percentage isn't normally used with a number (for instance, what percentage of the eggs are brown?). An exception to this rule is percentage points (for instance, 7 percentage points).

Percentage Calculator:

A calculator or device that applies a mathematical formula to determine a desired percentage from inputted amounts. The percentage formula consists of three variables. When you know any two of them, you can then determine the third one.

Read More: Sample Calculations...

You can get a few simple percentage calculators right here along with some sample calculations. If you ever find it necessary to determine percentages or learn how to figure out how to do a percentage, this free-of-charge website can assist you.

Sample Calculation #1: What is 50% of 800?

(800/100) x 50 = 400
To start, determine how much is 1% by dividing 800 by 100. It's 8. Next, multiply 8 by 50 so 8 x 50 = 400. The answer is 400.

Sample Calculation #2: 80 is what percent of 125?

80 x (125/100) = 64%
To start, determine how much is one percent by dividing 125 by 100.
Then, multiply one unit by 80 since we want to determine how much is 80 units. The answer is 64%

Sample Calculation #3: What is the percentage increase/decrease from 140 to 180?

(180-140) x (100/140) = 28.57%
140 is equivalent to 100 percent. So, 1% is equal to 100/140 = 0.71428
Next, subtract 140 from 180. 180 - 140 = 40. Therefore, 40 units are equal to 40 x 0.71428 = 28.57% that is the answer.
This is how an increase or decrease in percentage can be determined.