Number.parseFloat()

The Number.parseFloat() method parses an argument and returns a floating point number. If a number cannot be parsed from the argument, it returns NaN.

Syntax

Number.parseFloat(string)

Parameters

string
The value to parse. If this argument is not a string, then it is converted to one using the ToString abstract operation. Leading whitespace in this argument is ignored.

Return value

A floating point number parsed from the given string.

Or NaN when the first non-whitespace character cannot be converted to a number.

Polyfill

if (Number.parseFloat === undefined) {
  Number.parseFloat = parseFloat;
}

Examples

Number.parseFloat vs parseFloat

This method has the same functionality as the global parseFloat() function:

Number.parseFloat === parseFloat; // true

This method is also part of ECMAScript 2015. (Its purpose is modularization of globals.)

See parseFloat() for more detail and examples.

Specifications

Specification
ECMAScript (ECMA-262)
The definition of 'Number.parseFloat' in that specification.

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
parseFloatChrome Full support 34Edge Full support 12Firefox Full support 25IE No support NoOpera Full support 21Safari Full support 9WebView Android Full support ≤37Chrome Android Full support 34Firefox Android Full support 25Opera Android Full support 21Safari iOS Full support 9Samsung Internet Android Full support 2.0nodejs Full support 0.12

Legend

Full support  
Full support
No support  
No support

See also