Number.parseFloat()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The Number.parseFloat()
static method parses an argument and returns a floating point number. If a number cannot be parsed from the argument, it returns NaN
.
Try it
function circumference(r) {
if (Number.isNaN(Number.parseFloat(r))) {
return 0;
}
return parseFloat(r) * 2.0 * Math.PI;
}
console.log(circumference("4.567abcdefgh"));
// Expected output: 28.695307297889173
console.log(circumference("abcdefgh"));
// Expected output: 0
Syntax
Number.parseFloat(string)
Parameters
string
-
The value to parse, coerced to a string. 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.
Examples
Number.parseFloat vs. parseFloat
This method has the same functionality as the global parseFloat()
function:
Number.parseFloat === parseFloat; // true
Its purpose is modularization of globals.
See parseFloat()
for more detail and examples.
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-number.parsefloat |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
parseFloat |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support