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JavaScript toPrecision() Method

JavaScript Number Reference JavaScript Number Reference

Example

Format a number into a specified length:

var num = 13.3714;
var n = num.toPrecision(2);

The result of n will be:


Try it yourself »

Definition and Usage

The toPrecision() method formats a number to a specified length.

A decimal point and nulls are added (if needed), to create the specified length.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The toPrecision() method is supported in all major browsers.


Syntax

number.toPrecision(x)

Parameter Values

Parameter Description
x Optional. The number of digits. If omitted, it returns the entire number (without any formatting)

Return Value

Type Description
String The number formatted to the specified precision

Technical Details

JavaScript Version: 1.5


More Examples

Example

Format a number to a specified length:

var num = 13.3714;
var a = num.toPrecision();
var b = num.toPrecision(2);
var c = num.toPrecision(3);
var d = num.toPrecision(10);

The result of a,b,c,d will be:


Try it yourself »

Example

Format a number between 0 and 1:

var num = 0.001658853;
var a = num.toPrecision();
var b = num.toPrecision(2);
var c = num.toPrecision(3);
var d = num.toPrecision(10);

The result of a,b,c, and d will be:


Try it yourself »


JavaScript Number Reference JavaScript Number Reference

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