There are things in life that are not always easy to understand. One of them is percentages. But don't worry, we've all been there. This article aims to help you understand how to calculate a percentage, without the need for a calculator. So, whether you need to calculate the amount of your pay rise, the discount rate on your next purchase or simply because you like numbers, this article is for you.

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## Understanding the percentage formula

Before diving into the heart of the matter, it's crucial to understand the concept of percentage. A percentage is simply a way of expressing a fraction or part of 100. For example, if you have 25 euros out of 100 euros, this represents 25%.

To calculate a percentage, the formula is quite simple:

`(Value / Total) * 100 = Percentage`

This formula is the key to calculating percentages. It may seem complicated at first, but once you understand it, it's child's play.

## Mental calculation method for percentages

Now that you've understood the formula, let's move on to the mental calculation method. This method will enable you to calculate quickly percentages without a calculator.

To do this, simply break down the percentage you want to calculate into more manageable percentages. For example, to calculate 15% of an amount, it's easier to first calculate 10% of that amount, then add a further 5%.

As another example, to calculate 35%, you can calculate 30% (equivalent to 3 times 10%) and add 5%.

## How to calculate the percentage increase or reduction?

You often need to calculate a percentage increase or reduction. For example, you may need to know how much the price of a product has increased or decreased.

The formula is as follows:

`(Final value - Initial value) / Initial value * 100 = Percentage increase or reduction`

This formula will enable you to quickly determine the percentage increase or reduction.

## How to calculate a percentage without a calculator?

Now let's tackle the question of how to calculate a percentage without a calculator. There are several ways of doing this. One of the simplest is to use the basic percentage formula and do the mental calculation.

For example, if you want to know what percentage 20 euros represents of a total of 200 euros, you use the formula `(Value / Total) * 100`

. This results in `(20 / 200) * 100 = 10%`

.

You can also use a fraction method. For example, if you want to know what percentage 1/5 represents, you know that 1/5 equals 20% because 100 divided by 5 is 20.

In conclusion, calculating a percentage may seem daunting at first, but once you know the formula and have some practice, it's actually quite simple. And best of all, you don't even need a calculator to do it. So the next time you're wondering **"how to calculate a percentage without a calculator**Remember this article and the methods you learned from it. You'll be able to calculate percentages quickly and confidently. Now it's your turn!

### Become a percentage master

Now that you've got all the keys to becoming a percentage master, don't hesitate to put your new skills into practice. Whether you need to calculate it quickly in your head, evaluate a price increase or reduction, or even apply it to your salary, percentages will no longer hold any secrets for you. So don't give up when faced with numbers, and remember: calculating is also a matter of practice and habit.