Free online electrical load calculators are available at NoJolt.com and Ask-the-Electrician.com, as of 2015. Sources for free downloadable electrical load calculator software include CCM.net, Electrical-Engineering-Portal.com and En.Softonic.com.
NoJolt.com features the NEC Standard Method Single Family Residential electric service entrance load calculator. The calculator determines the necessary electrical load for a dwelling by automatically calculating data that includes the total square feet of the dwelling, the number of small appliance branch circuits, the number of laundry branch circuits and the number of water heaters.
Ask-the-Electrician.com provides an online electrical load calculator, as well as an introduction to the calculator and systematic instructions for its use. The website also provides links to additional free online calculators and formula generators.