JavaScript Math round( ) Method

Below is the example of the Math round() Method.

  • Example: To round off a number to its nearest integer.
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    <script type="text/javascript">
        var round =Math.round(5.8);
        document.write("Number after rounding : " + round); 
    </script>

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  • Output:
    Number after rounding : 6

The Math.round() method is used to round a number to its nearest integer. If the fractional part of the number is greater than or equal to .5, the argument is rounded to the next higher integer. If the fractional part of the number is less than .5, the argument is rounded to the next lower integer.

Syntax:

Math.round(value);

Parameters: This method accepts a single parameter as mentioned above and described below:

  • value: It is the number which you want to round off.

Return Value: The Math.round() method returns the value of the given number rounded to the nearest integer.



More codes for the above method are as follows:

Program 1: The Math.round() method itself rounds off a negative number when passed as parameter to it. To round off a negative number to its nearest integer, the Math.round() method should be implemented in the following way:

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<script type="text/javascript">
    var round =Math.round(-5.8);
    document.write("Number after rounding : " + round); 
</script>

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Output:

Number after rounding : -6

Program 2: Below program shows the result of Math.round() method when the parameter has “.5” in decimal.

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<script type="text/javascript">
    var round =Math.round(-12.5);
    document.write("Number after rounding : " + round +
    "<br>");
    var round =Math.round(12.51);
    document.write("Number after rounding : " + round); 
</script>

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Output:

Number after rounding : -12
Number after rounding : 13

Supported Browsers:

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

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