**Calculate 20% of a quantity** can be very useful at a given moment to know the discount applied in an offer or any other purpose.

Our percentage calculator will allow you to **to get that 20 percent of the figure you want** immediately. Just type the amount, press the Calculate button and you will automatically know the value of your 20%. If you want to calculate any other percentage, do not hesitate to visit our percent calculator.

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## How to calculate 20 percent of an amount

To calculate 20 percent of a number we only have to apply a simple rule of three:

In this case, each unknown would be:

- B: Number from which we want to find its 20%
- We would still need to know the value of 'Y' whose value would be 20 percent of the initial number.

We can clear the value we are interested in as follows:

Y = quantity x 20 / 100 = quantity x 0.2

To make it clearer, we will now see how the above applies to a practical example.

## Calculate 20 percent of 50

To obtain the 20% of the number 50, we will use the formula we have seen before:

Y = quantity x 0.2 = 50 x 0.2 = 10

As you can see, it is very easy **calculate 20 percent of any number** with a simple multiplication

## Calculate 20 percent in Excel

If you want to calculate the** 20% of a cell in Excel**the formula to be used is as follows:

=cell*20%

Where cell you have to write the coordinates of the cell where the number you want to calculate the percentage is located.