I've made my own for residential, easy to add/remove and maniplate to my advantage or customize to job.
http://www.markhellerelectric.com/Resi%20Calc.xlt

Haven't gotten around to a commercial one yet....

Mike Holt also has one in the free stuff area http://www.mikeholt.com/freestuff.php?id=freegeneral

Mark Heller
"Well - I oughta....." -Jackie Gleason