JavaScript parseFloat() Function

Function Reference JavaScript Global Functions

Example

Parse different strings:

var a = parseFloat("10") + "<br>";
var b = parseFloat("10.00") + "<br>";
var c = parseFloat("10.33") + "<br>";
var d = parseFloat("34 45 66") + "<br>";
var e = parseFloat(" 60 ") + "<br>";
var f = parseFloat("40 years") + "<br>";
var g = parseFloat("He was 40") + "<br>";

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: 1.0

Function Reference JavaScript Global Functions

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