Residential electrical load calculator

Estimate total amperage demand using NEC standard load calculation method to size a residential service panel (100A vs 200A).

Heated living space (sqft)

Small-appliance + laundry circuits

NEC requires 2 small-appliance + 1 laundry minimum = 3 × 1500 VA.Electric range (kW)

Standard 30A range: 8-12 kW. Pro range: 14-20 kW. 0 if gas.Electric water heater (kW)

Standard tank: 4.5 kW. Tankless electric: 18-27 kW. 0 if gas.Electric dryer (kW)

Largest HVAC load (kW)

Heat pump 3-ton: ~6-8 kW. AC + electric heat: use the larger of the two.EV charger (kW)

Level 2 32A: 7.7 kW. 48A: 11.5 kW. 0 if no EV.Other fixed loads (kW total)

Pool pump, hot tub, well pump, electric heat in detached garage, etc.

Service amps required

@ 240 V

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