Format Currency

This function will round numbers to two decimal places, and ensure that the returned value has two decimal places. For example 12.006 will return 12.01, .3 will return 0.30, and 5 will return 5.00

function CurrencyFormatted(amount) {
	var i = parseFloat(amount);
	if(isNaN(i)) { i = 0.00; }
	var minus = '';
	if(i < 0) { minus = '-'; }
	i = Math.abs(i);
	i = parseInt((i + .005) * 100);
	i = i / 100;
	s = new String(i);
	if(s.indexOf('.') < 0) { s += '.00'; }
	if(s.indexOf('.') == (s.length - 2)) { s += '0'; }
	s = minus + s;
	return s;


  1. Chase Moskal
    Permalink to comment#

    If you want a smaller function:

    function currency(N){N=parseFloat(N);if(!isNaN(N))N=N.toFixed(2);else N='0.00';return N;}
    // >> currency("-14"): "-14.00" 

    If you want a smaller, more inline alternative, you can do this:

    // Right after you declare your number (N), the rest of the line does the formatting.
    var N=24.686; N=parseFloat(N);if(!isNaN(N))N=N.toFixed(2);else N='0.00';
    // >> N: "24.69"


    • Chase Moskal
      Permalink to comment#

      Hey, here’s myself from the future. I re-gazed upon this, and further improved things:

      function currency(n){n=parseFloat(n);return isNaN(n)?false:n.toFixed(2);}

      currency(2); //--> '2.00'
      currency(3.253); //--> '3.25'
      currency(3.257); //--> '3.26'
      currency("3.2"); //--> '3.20'
      currency("butts"); //--> false
  2. Andras
    Permalink to comment#

    Is it a css trick?

  3. Thang
    Permalink to comment#

    Hi all!!

    Is there any way to add comma while typing number? and we can edit all of number.

    Ex: 123,456,555, we can edit number 1 –> 6


    • Paul C Allsopp
      Permalink to comment#

      On keyup check the length of the field. If it is greater than 4 and contains no period, add a comma after every 3rd number from the right. When a period is encountered, set a flag to stop the formatting.

  4. Manie
    Permalink to comment#

    The website’s name is css-tricks but you give a Java solution?

  5. mahesh
    Permalink to comment#

    i want to put auto price changer to my website

    please review my website:

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