Electrical Load Calculator

Electrical load is calculated by adding up all the electrical demands in your home including general lighting (3VA per sqft), small appliance circuits (1500VA each), major appliances, HVAC systems, and other loads. The total is then used to determine the required electrical service size.

The minimum electrical service size for most modern homes is 100 amps, though many homes today require 200 amp service to accommodate modern electrical loads including electric vehicles, heat pumps, and multiple appliances.

The NEC requires a minimum of 2 small appliance circuits for kitchens and dining areas, each rated at 1500VA. Additional circuits may be needed for larger kitchens or homes with extensive counter space.

Yes, if you plan to install an EV charger, it should be included in your load calculation. A typical Level 2 EV charger adds approximately 7200VA (30-40 amps) to your total electrical load.

Use the nameplate rating found on each appliance. For planning purposes, typical values are: electric range (8000VA), electric dryer (5000VA), dishwasher (1200VA), garbage disposal (900VA), and microwave (1500VA).

The NEC requires 3VA per square foot for general lighting and receptacle loads. This covers basic lighting, outlets, and general electrical needs throughout the living space of your home.

You need a professional load calculation when applying for electrical permits, upgrading your electrical service, adding major appliances, or installing EV chargers. Many jurisdictions require calculations stamped by a licensed electrician.

If your calculated load exceeds your current electrical service capacity, you'll need to upgrade your electrical panel and service entrance. This requires a licensed electrician and electrical permits from your local authority.