Web/JavaScript/Reference/Global objects/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

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`parseFloat`	Chrome Full support 34	Edge Full support 12	Firefox Full support 25	IE No support No	Opera Full support 21	Safari Full support 9	WebView Android Full support ≤37	Chrome Android Full support 34	Firefox Android Full support 25	Opera Android Full support 21	Safari iOS Full support 9	Samsung Internet Android Full support 2.0	nodejs Full support 0.12

Legend

Full support: Full support
No support: No support