Calculate Factorial of a number using JavaScript

Here you will learn to calculate Factorial of a number using JavaScript using HTML language.

Factorial is a mathematical operation that multiplies a given number by every number below it.

For example:

Factorial of 6 is 6 x 5 x 4 x 3 x 2 x 1 = 720

Program code to Calculate Factorial of a number using JavaScript

<!DOCTYPE html>

<html>

<head>

function calculateFactorial() {

var number = document.getElementById("number").value;

var result = 1;

for (var i = 1; i <= number; i++)

result = result * i;

document.getElementById("factResult").innerHTML = "Factorial of " + number + " is " + result;

}

</script>

</head>

<body>

<h1>Calculate Factorial of a Number Using JavaScript</h1>

<button type="button" onclick="calculateFactorial()">Calculate Factorial</button>

</body>

</html>

Output

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