JavaScript Math.ceil()
Syntax & Examples

Math.ceil() static-method

The Math.ceil() method in JavaScript returns the smallest integer greater than or equal to a given number. It is a static method of Math, meaning it is always used as Math.ceil() and not as a method of a Math object created (Math is not a constructor).

Syntax of Math.ceil()

The syntax of Math.ceil() static-method is:

Math.ceil(x)

This ceil() static-method of Math returns the smallest integer greater than or equal to x.

Parameters

ParameterOptional/RequiredDescription
xrequiredA number for which to return the smallest integer greater than or equal to it.

Return Type

Math.ceil() returns value of type Number.


✐ Examples

1 Using Math.ceil() with a positive number

In this example, we use the Math.ceil() method to find the smallest integer greater than or equal to 4.2.

For example,

  1. We call Math.ceil() with 4.2 as the argument.
  2. The method returns the smallest integer greater than or equal to 4.2.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.ceil(4.2));

Output

5

2 Using Math.ceil() with a negative number

In this example, we use the Math.ceil() method to find the smallest integer greater than or equal to -4.2.

For example,

  1. We call Math.ceil() with -4.2 as the argument.
  2. The method returns the smallest integer greater than or equal to -4.2.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.ceil(-4.2));

Output

-4

3 Using Math.ceil() with an integer

In this example, we use the Math.ceil() method on an integer, which returns the integer itself.

For example,

  1. We call Math.ceil() with 7 as the argument.
  2. The method returns the smallest integer greater than or equal to 7.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.ceil(7));

Output

7

Summary

In this JavaScript tutorial, we learned about ceil() static-method of Math: the syntax and few working examples with output and detailed explanation for each example.