JavaScript parseFloat()

Parse different values:

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

More examples below.

Description

The 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.

parseFloat( value)

Parameter	Description
value	Required. The value to parse.

Type	Description
A number	NaN if no number is found.

parseFloat() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

Parse different values:

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