The free Residential Electrical Service Size Calculator will help you determine the correct electrical service size. All you have to do is enter basic information about the house. The Calculator does the rest. It will tell you the Demand Load, closest standard Main Breaker size, Service Conductor sizes for both aluminum and copper and the correct Conduit size. The calculator requires Microsoft Windows 7 or Vista and Office 2007 or 2010.
Download the calculator: http://www.bestinspectors.net/members-freestuff.htm. Scroll down. It is near the bottom of the page.
If you have any questions, call me.