Service size calculations

[wi-elec]

Most of the time I do most of my service size calculations via pencil and paper, problem being we are starting to do projects that are bigger than what I would consider pencil and paper. My question is, does anyone know of a good computer program that is fairly plug and play to spit me out service size calcs. Preferably not like the Simpsons episodes.
Thanks

 

[Dennis Alwon]

For residential Mike Holt has a free one here. Just download the excel spreadsheet.

I did this a few years back and you needed a password to open the file. Here it is
Residential Spreadsheet
AABBAABAABAG

 

[wi-elec]

I actually need a program for medium scale commercial applications.