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    <p>I changed the sum line to</p> <pre><code>distanceTravelled += distances[i]; </code></pre> <p>I also swapped the dynamic values with temporary ones, it displayed <code>$150</code>, which is the expected result (and nothing to do with brackets as mentioned by @cbp).</p> <pre><code>function calcRate() { var engineRate = 10; var distanceTravelled = 0.0; var distances = new Array(); distances[0] = 1; distances[1] = 2; distances[2] = 3; distances[3] = 4; distances[4] = 5; for (var i = 0; i &lt; distances.length; i++) { if (!isNaN(distances[i])) { distanceTravelled += distances[i]; } } alert("$" + distanceTravelled * engineRate); } calcRate(); </code></pre> <p><a href="http://jsfiddle.net/tcEpF/2/" rel="nofollow">http://jsfiddle.net/tcEpF/2/</a></p> <p>I then swapped in the jQuery selector for the output text box, it displays <code>$150</code>:</p> <pre><code>&lt;input name="reimbursement" /&gt; </code></pre> <p><a href="http://jsfiddle.net/tcEpF/3/" rel="nofollow">http://jsfiddle.net/tcEpF/3/</a></p> <p>Assuming the engine rate are radio buttons, I proceeded to add them in:</p> <pre><code>&lt;input type="radio" name="enginesize" value="10" /&gt;10&lt;br&gt; &lt;input type="radio" name="enginesize" value="100" /&gt;100&lt;br&gt; &lt;input type="radio" name="enginesize" value="1000" /&gt;1000&lt;br&gt; </code></pre> <p>Clicking on any of them displays the expected results: $150, $1500, $15000</p> <p><a href="http://jsfiddle.net/tcEpF/4/" rel="nofollow">http://jsfiddle.net/tcEpF/4/</a></p> <p><strong>I can only conclude that the selector for <code>field_Distance</code> is wrong:</strong></p> <pre><code>jQuery("#field_Distance1") </code></pre> <p>You might want to use this instead to get the name of the field, as <code>#</code> means you are getting the ID attribute instead, which is probably missing.</p> <pre><code>jQuery("input[name=field_Distance1]") </code></pre> <p>Why is it displaying <strong>$0</strong> then? As the selector is wrong, the array now contains <code>NaN</code> values. distanceTravelled remains as <code>0.0</code> after the for-loop as <code>!isNaN(distances[i])</code> returns false, skipping over the sum. In the end, anything multiplied by 0 returns 0.</p>
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    1. COSuccess. Changing the selector from id to input[name=xxxx] worked, however I can assure you that the selector attribute was correct. Any ideas what caused this?
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    2. COSee updated answer.
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