Hi Chynna,

Your subtotal fields are being added together as strings, not numbers ('1'+'20'+30' = '12030'). In Forms 10, field calculations are available out of the box, no coding needed. In Forms 9, you need to use a parseNumber function to change the strings to numbers:

function parseNumber(n) {
  var f = parseFloat(n); //Convert to float number.
  return isNaN(f) ? 0 : f; //treat invalid input as 0;
}

The way your code is set up, you would need to place each of your values inside of this function (where 'n' is on line 1). However, if you give each of your Subtotal fields the 'subtotal' class, the code would be be much easier to manage. You can add classes to fields by typing them into the "CSS class" section of the field's advanced tab. To add multiple classes to a field, just separate them by a space. For example, I have assigned the following field three different classes:

If you assign the "subtotal" class to each of your Subtotal fields, then the following code would be one way to achieve your goal:

$(document).ready(function(){
  $('#q73 input').prop('readOnly', true); //Set Total to Read-Only
  $(document).on('change', '.subtotal input', function(){ //When a Subtotal field changes...
    var total = 0;
    $('.subtotal input').each(function(){ //For each Subtotal input...
      var subtotal = parseNumber($(this).val()); //Convert the value to a number
      total += subtotal; //Add all the numbers up
    });
    $('#q73 input').val(total); //Put the result into the Total field
  });
  function parseNumber(n){
    var f = parseFloat(n); //Convert to float number.
    return isNaN(f) ? 0 : f; //treat invalid input as 0;
  }
});

Let me know if this works for you!