JavaScript Number.parseFloat()

Number.parseFloat(10);
Number.parseFloat("10");
Number.parseFloat("10.33");
Number.parseFloat("34 45 66");
Number.parseFloat("He was 40");

Number.parseFloat("40.00");
Number.parseFloat(" 40 ");
Number.parseFloat("40 years");
Number.parseFloat("40H")
Number.parseFloat("H40");

Description

The Number.parseFloat() method parses a value as a string and returns the first number.

If the first character cannot be converted, NaN is returned.

Leading and trailing spaces are ignored.

Only the first number found is returned.

Number.parseFloat( value)

Parameter	Description
value	Required. The value to parse.

Type	Description
Number	NaN if no number is found.

Number.parseFloat() is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers:


Chrome	Edge	Firefox	Safari	Opera
Yes	Yes	Yes	Yes	Yes

Number.parseFloat() is not supported in Internet Explorer 11 (or earlier).