JavaScript parseFloat – Convert String to Float Number

JavaScript parseFloat () function; Through this tutorial, i am going to show you how to convert string to float number using parseFloat() with the help of examples.

Convert a String to float Number in javascript

  • JavaScript parseFloat() Function
  • JavaScript parseFloat() Function Syntax
  • Examples Convert a String to float Number in javascript

JavaScript parseFloat() Function

The parseFloat() function is used to accept a string and convert it into a floating-point number. If the input string does not contain a numeral value or If the first character of the string is not a number then it returns NaN i.e, not a number. This function returns a floating-point number parsed up to that point where it encounters a character that is not a number.

Syntax of JavaScript parseFloat() Function

The syntax of javascript parseFloat () is very simple. The JavaScript parseFloat () should look like this :

  • Params : It accepts a parameter “string value” that contains a string that is changed to floating-point number.

To understand what parseFloat is in JavaScript, it is necessary to see an example. Take a look at this parseFloat function example – where we parse different numbers and strings :

Example 1 – Convert a String to float Number in javascript

 // return float value
a = parseFloat("  10  ")
document.write('parseFloat("  10  ") = ' +a +"<br>");
b = parseFloat("123abc")
document.write('parseFloat("123abc") = '+b +"<br>");
// returns NaN value
c = parseFloat("abc456")
document.write('parseFloat("abc456") = ' +c +"<br>");
d = parseFloat("3.14")
document.write('parseFloat("3.14") = '+d +"<br>");
// returns only first Number
e = parseFloat("18 2 2019")
document.write('parseFloat("18 2 2019") = ' +e +"<br>");


parseFloat(" 10 ") = 10
parseFloat("123abc") = 123
parseFloat("abc456") = NaN
parseFloat("3.14") = 3.14
parseFloat("18 2 2019") = 18

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