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<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<h2>JavaScript Celcius to Fahrenhet</h2>
<p>Insert a number into one of the input fields below:</p>

 <script>
  function convert()
   {  var c ;
    c  = (document.getElementById('cel1').value * 9/5) + 32;
    document.getElementById('fah1').value=Math.round(c);
    }

   function convert1()
    {
      var f;
      f=(document.getElementById('fah1').value - 32)*5/9;
    document.getElementById('cel1').value=Math.round(f);
    }

</script>
<form name='myform' method='post'>
  <table>
    <tr><td>celsius:</td><td><input type='text' id='cel1' onkeyup='convert()'/></td></tr>
<tr><td>Fahrenheit:</td><td><input type='text' id='fah1' onkeyup='convert1()'/></td></tr>
  </table>
</form>


</body>
</html>