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JavaScript parseFloat() Function


Function Reference JavaScript Global Functions

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.

Syntax

parseFloat(string)

Parameter Description
string Required. The string to be parsed


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The parseFloat() function is supported in all major browsers.


Tips and Notes

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.


Example

Example

Parse different strings:

<script type="text/javascript">

document.write(parseFloat("10") + "<br />");
document.write(parseFloat("10.33") + "<br />");
document.write(parseFloat("34 45 66") + "<br />");
document.write(parseFloat(" 60 ") + "<br />");
document.write(parseFloat("40 years") + "<br />");
document.write(parseFloat("He was 40") + "<br />");

</script>

The output of the code above will be:

10
10.33
34
60
40
NaN

Try it yourself »


Function Reference JavaScript Global Functions

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