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JavaScript Program to find Factorial of a Number

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What is Factorial of a Number?

The factorial of a number n can be defined as the product of all positive numbers less than or equal to n. For example, the factorial of 6 is 1 × 2 × 3 × 4 × 5 × 6 = 720.


The following table provides few examples of factorial of a number.

1! 1 1
2! 1 × 2 2
3! 1 × 2 × 3 6
4! 1 × 2 × 3 × 4 24

Note: In Mathematics, factorial of a number is represented by exclamation mark.

Tips: It is recommended to use our online Factorial of a Number calculator for better understanding.

Find a Factorial of a Number

In the following example, we will find a factorial of a number 6.


HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Factorial of a Number</h1> <script> var num = 6; var i = 1; var factorial = 1; for(i = 1; i <= num; i++) factorial *= i; if(num) document.write("Factorial of "+num+": "+factorial); else document.write("Factorial of 0: 0"); </script> </body> </html>

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