To get the smallest integer greater than or equal to a number, use the JavaScript Math.ceil() method. This method returns the smallest integer greater than or equal to a number.
Example
You can try to run the following code to get the smallest integer greater than or equal to a number −
<html>
<head>
<title>JavaScript Math ceil() Method</title>
</head>
<body>
<script>
var value = Math.ceil(80.55);
document.write("First Value : " + value );
value = Math.ceil(42.45);
document.write("<br />Second Value : " + value );
value = Math.ceil(-70.70);
document.write("<br />Third Value : " + value );
value = Math.ceil(-20.30);
document.write("<br />Fourth Value : " + value );
</script>
</body>
</html>