# Factorial Calculator

Factorial Calculator

In Mathematics, factorial means multiplying the given number by every natural number which comes below it. For example, if we say that we want to calculate the factorial of n, we are going to multiply n by every natural number below it.

## Factorial Calculator

Formula –

n! = n × (n-1) × (n-2) × ….. × 3 × 2 × 1

You can use our Factorial calculator to calculate the factorial of the given number.

### How to calculate factorial?

Well, to calculate the factorial of some number, you just need to find a product of all integers from 1 to that particular number. For example, if we are calculating the factorial of 5, then we are going to calculate the product of all the integers from 1 to 5. This will go like – 5×4×3×2×1, which comes out to be 120. So, the factorial of 5 comes out to be 120. We can write it like this –

5! = 120

You can try solving several examples, and also use our calculator to calculate the factorial of some numbers.

1. What is 0!?

Ans: Well, the answer to 0! is 1.

2. How do you calculate factorial?

Ans: If we want to calculate the factorial of n, we can simply multiply that n by every natural number below it. In other words, we can use this formula – n! = n × (n-1) × (n-2) × ….. × 3 × 2 × 1

3. What is the use of calculating factorial?

Ans: Factorial can be required in doing many calculations, like when we are dealing with permutations and combinations. For example, if we want to arrange 3 different toys, in how many ways can we do it? This goes a little bit tricky, but if you try to solve it, it comes out to be 6, which is 3!

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