JavaScript parseFloat() Function

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JavaScript parseFloat() Function

❮ JavaScript Global Functions

Example

Parse different strings:

var a = parseFloat("10") + " ";
var b = parseFloat("10.00") + " ";

var c = parseFloat("10.33") + " ";
var d = parseFloat("34 45 66") + " ";

var e = parseFloat(" 60 ") + " ";
var f = parseFloat("40 years") + " ";

var g = parseFloat("He was 40") + " ";

var n = a + b + c + d + e + f + g;

<!--

The result of n will be:

10
10
10.33
34
60
40
NaN

-->
Try it Yourself »

Definition and Usage

The parseFloat() function parses a string and returns a floating point number.

This function determines if the first character in the specified string is a
number. If it is, it parses the string until it reaches the end of the number, and returns the number as a number, not as a string.

Note: Only the first number in the string is returned!

Note: Leading and trailing spaces are allowed.

Note: If the first character cannot be converted to a number, parseFloat() returns NaN.

Browser Support

Function
parseFloat()	Yes	Yes	Yes	Yes	Yes

Syntax

parseFloat(string)

Parameter Values

Parameter	Description
string	Required. The string to be parsed

Technical Details

Return Value:	A Number. If the first character cannot be converted to a number, NaN is returned
JavaScript Version:	ECMAScript 1

❮ JavaScript Global Functions

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