calcTbl

calcz

by khemikal

HTML

<table>
  <tbody>
    <th>test0</th>
    <th>test1</th>
    <th>test2</th>
    <tr>
      <td class="sub1">1</td>
      <td class="sub2">2</td>
      <td class="sub3">0</td>
    </tr>
    <tr>
      <td class="sub1">3</td>
      <td class="sub2">4</td>
      <td class="sub3">0</td>
    </tr>
    <tr>
      <td class="sub1">5</td>
      <td class="sub2">6</td>
      <td class="sub3">0</td>
    </tr>
  </tbody>
</table>

JavaScript

$(function subP() {
  $('.sub3').text(function() {
    var $this = $(this);
    var sub1 = +$this.siblings('.sub1').text();
    var sub2 = +$this.siblings('.sub2').text();
    return ((sub1 - sub2) / sub2).toFixed(2);
  });

});