JavaScript Math.ceil( ) function

Math.ceil() function in JavaScript is used to round the number passed as a parameter to its nearest integer in an Upward direction of rounding i.e. towards the greater value.

Syntax:

Math.ceil(value);

Parameters:

This function accepts a single parameter as the number to be rounded to its nearest integer in the upward rounding method. 

Return Value:

Result after rounding the number passed as a parameter to the function.

Examples:

Input  : Math.ceil(4.23)
Output : 5
Input  : Math.ceil(0.8)
Output : 1

Errors and Exceptions:

• A non-numeric string passed as a parameter returns NaN.
• An array with more than 1 integer passed as a parameter returns NaN.
• An empty variable passed as a parameter returns NaN.
• An empty string passed as a parameter returns NaN.
• An empty array passed as a parameter returns NaN.

Example 1: In this example, we have used Math.ceil function.

Javascript

<!-- NEGATIVE NUMBER EXAMPLE -->
console.log(Math.ceil(-2));
console.log(Math.ceil(-2.56));

Output

-2
-2

Example 2: In this example, we have used Math.ceil function.

Javascript

<!-- POSITIVE NUMBER EXAMPLE -->
console.log(Math.ceil(2));
console.log(Math.ceil(2.56));

Output

2
3

Example 3: In this example, we have used Math.ceil function.

Javascript

console.log(Math.ceil("Geeksforgeeks"));

Output

NaN

Example 4: In this example, we have used Math.ceil function.

Javascript

<!-- ADDITION INSIDE FUNCTION EXAMPLE -->
console.log(Math.ceil(7+9));

Output

16

Supported Browsers:

• Google Chrome 1 and above
• Internet Explorer 12 and above
• Firefox 1 and above
• Opera 3 and above
• Safari 1 and above