NEC Standard Method Single Family Residential - Electric Service Entrance Load Calculator

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Enter plain numbers in cells without text or labels. If you leave any cells empty they will be calculated as zero.

Total Square feet of dwelling

Total # of Small Appliance Branch circuits (must be at least 2). If you have gas appliances which require a 120v branch circuit include them here.

Total # of Laundry Branch circuits (must be at least 1)

Fastened in place Electrical appliances - Do not include gas appliances in this section. Use nameplate rating in volt-amps or watts - If appliance is rated in amps then volt-amps = amps * volts. Voltage value is either 120 or 240. So, for a 120 volt appliance which is rated at 15 amps, 120 volts * 15 amps = 1800 volt-amps.

Total # of water heaters

Volt-amp rating of water heater


Total # of trash compactors

Volt-amp rating of trash compactor


Total # of dishwashers

Volt-amp rating of dishwasher


Total # of disposals

Volt-amp rating of disposal


Total # of microwave ovens

Volt-amp rating of microwave oven


Total # of range hoods

Volt-amp rating of range hood


Other fastened in place appliances - use this section to define things like spas which aren't specified above.

Total # of other fastened in place appliance #1

Volt-amp rating of other fastened in place appliance #1


Total # of other fastened in place appliance #2

Volt-amp rating of other fastened in place appliance #2


Total # of other fastened in place appliance #3

Volt-amp rating of other fastened in place appliance #3


Total # of clothes dryers

Volt-amp rating of clothes dryer (must be at least 5000)


Total # of Ranges

Volt-amp rating of Range


Total # of Ovens - Note: If there is a range, and no additional oven then don't put anything here.

Volt-amp rating of Oven


Total # of Cooktops - Note: If there is a range, and no additional cooktop then don't put anything here.

Volt-amp rating of Cooktop


Total # of Other cooking appliance over 1750 volt-amps

Volt-amp rating of Other cooking appliance over 1750 volt-amps


Volt-amp rating of Larger of Heating OR Air conditioning system - always include air handler. For heat pump include compressor and the maximum amt of electrical heat that can be energized while compressor is running.


Volt-amp rating of Largest Single Motor (usally the HVAC compressor or air handler motor)


Service voltage is assumed to be 240

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