Factorial calculator

Factorial calculator lets you find the factorial of a given number with calculation steps. Enter your number and click calculate to start.

Input

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Result

Factorial of 5 or 5! is

How to calculate factorial?

To calculate the factorial of a number n or n!, we can multiply numbers from 1 to n to obtain the factorial of n.

Thus, factorial of 5 or 5! can be written as follows:

Factorial table

n	n!	Description
0	0! = 1	Factorial of 0 is 1
1	1! = 1	Factorial of 1 is 1
2	2! = 2	Factorial of 2 is 2
3	3! = 6	Factorial of 3 is 6
4	4! = 24	Factorial of 4 is 24
5	5! = 120	Factorial of 5 is 120
6	6! = 720	Factorial of 6 is 720
7	7! = 5040	Factorial of 7 is 5040
8	8! = 40320	Factorial of 8 is 40320
9	9! = 362880	Factorial of 9 is 362880
10	10! = 3628800	Factorial of 10 is 3628800
11	11! = 39916800	Factorial of 11 is 39916800
12	12! = 479001600	Factorial of 12 is 479001600
13	13! = 6227020800	Factorial of 13 is 6227020800
14	14! = 87178291200	Factorial of 14 is 87178291200
15	15! = 1307674368000	Factorial of 15 is 1307674368000
16	16! = 20922789888000	Factorial of 16 is 20922789888000
17	17! = 355687428096000	Factorial of 17 is 355687428096000
18	18! = 6402373705728000	Factorial of 18 is 6402373705728000
19	19! = 121645100408832000	Factorial of 19 is 121645100408832000
20	20! = 2432902008176640000	Factorial of 20 is 2432902008176640000

What is factorial?

Factorial is the product of all positive integers less than or equal to n, denoted by n! where n is a non-negative integer. The factorial of n also equals the product of n with the next smaller factorial. For example, that is because 5! = 5 × 4! = 5 × 4 × 3 × 2 × 1, The value of 0! is 1, according to the convention for an empty product (from Wikipedia).