Working off Paul Grenier’s post JQuery for Everyone: Total Calculated Columns and some hair loss, I got this working in SharePoint 2010.

Need to sum / total a calculated column in SharePoint 2010, here is the answer.

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script> 
<script type="text/javascript">
function addCommas(nStr) {//formats number
	nStr += '';
	x = nStr.split('.');
	x1 = x[0];
	x2 = x.length > 1 ? '.' + x[1] : '';
	var rgx = /(\d+)(\d{3})/;
	while (rgx.test(x1)) {
		x1 = x1.replace(rgx, '$1' + ',' + '$2');
	}
	return x1 + x2;
}
$(function() {//sums money in specific list column
	var col = 2; //which column to sum
	var m = "$"; //change to "" for non-money format
	var headers = $("table.ms-listviewtable:first> tbody> tr:first th").get();
 	var arrayList = $("table.ms-listviewtable:first> tbody> tr:gt(1)").find(">td:eq("+col+")").get();
	var x = 0;
	var p1 = "";
	var p2 = "";
	$.each(arrayList, function(){
		x += Number($(this).text().replace(/$|,|\)/g, "").replace(/\(/g,"-"));
	});
	if (x < 0) {//format for negative numbers
		p1 = "(";
		p2 = ")";
		x = Math.abs(x);
	}
	
	$(".ms-listviewtable:first> tbody> tr:eq(1)").find(">td:eq("+col+")")
		.css("text-align","middle")
		.html("<b>Total = "+p1+m+addCommas(x.toFixed(2))+p2+"</b>");
});
</script>