JavaScript round() Method

Definition and Usage

round() The method rounds a number to the nearest integer.

Comment：2.49 will be rounded down (2), while 2.5 will be rounded up (3).

Note

For 0.5, the method will perform ceiling rounding.

For example, 3.5 will be rounded to 4, and -3.5 will be rounded to -3.

Example

Example 1

Round a number to the nearest integer：

Math.round(2.5);

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Example 3

Round different numbers to the nearest integer：

var a = Math.round(2.60);
var b = Math.round(2.50);
var c = Math.round(2.49);
var d = Math.round(-2.60);
var e = Math.round(-2.50);
var f = Math.round(-2.49);

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Syntax

Math.round(x)

Parameter Value

Parameter Description
x Required. The number to be rounded.

Technical Details

Return Value： Number, representing the nearest integer.
JavaScript Version: ECMAScript 1

Browser Support

Method Chrome IE Firefox Safari Opera
round() Support Support Support Support Support

Related Pages

Tutorial:JavaScript Suanxue