JavaScript Math.ceil( ) function

The JavaScript Math.ceil() function rounds a given number up to the nearest integer. It always rounds towards positive infinity, meaning it increases the number to the next whole number if it's not already an integer. This function is useful for rounding up values in calculations.

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: The 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, Math.ceil rounds a number up to the nearest integer. For negative numbers, it moves towards zero, making -2 and -2.56 round to -2.

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

-2
-2

Example 2: In this example, Math.ceil rounds numbers up to the nearest integer. For positive numbers, it moves to the next higher integer, making 2 and 2.56 round to 3.

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

2
3

 Example 3: In this example, Math.ceil("Geeksforgeeks") returns NaN since it cannot convert the string to a number for rounding.

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

NaN

Example 4: In this example, Math.ceil(7 + 9) calculates the ceiling of the sum, which is 16, as the result is already an integer.

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

16

Supported Browsers:

• Google Chrome
• Edge 
• Firefox
• Opera
• Safari