JavaScript Math.round()
Syntax & Examples

Math.round() static-method

The Math.round() method in JavaScript returns the value of a number rounded to the nearest integer. If the fractional part of the number is 0.5 or greater, the argument is rounded to the next higher integer; if the fractional part is less than 0.5, the argument is rounded to the lower integer. It is a static method of Math, meaning it is always used as Math.round() and not as a method of a Math object created (Math is not a constructor).

Syntax of Math.round()

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

Math.round(x)

This round() static-method of Math returns the value of the number x rounded to the nearest integer.

Parameters

ParameterOptional/RequiredDescription
xrequiredA number to be rounded to the nearest integer.

Return Type

Math.round() returns value of type Number.


✐ Examples

1 Using Math.round() with a positive number

In this example, we use the Math.round() method to round the number 4.7 to the nearest integer.

For example,

  1. We call Math.round() with 4.7 as the argument.
  2. The method returns the value of 4.7 rounded to the nearest integer.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.round(4.7));

Output

5

2 Using Math.round() with a negative number

In this example, we use the Math.round() method to round the number -4.7 to the nearest integer.

For example,

  1. We call Math.round() with -4.7 as the argument.
  2. The method returns the value of -4.7 rounded to the nearest integer.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.round(-4.7));

Output

-5

3 Using Math.round() with a number having .5 fractional part

In this example, we use the Math.round() method to round the number 5.5 to the nearest integer.

For example,

  1. We call Math.round() with 5.5 as the argument.
  2. The method returns the value of 5.5 rounded to the nearest integer.
  3. We log the result to the console using console.log().

JavaScript Program

console.log(Math.round(5.5));

Output

6

Summary

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