Calculator · NEC Article 220

Dwelling load.

3 VA per square foot. Two small appliances and a laundry. First 3,000 at 100%, the rest at 35%. Larger of heat or AC, never both. EVSE is continuous and gets 1.25.

Square footage of dwelling

Small appliance circuits (min 2)Laundry circuits (min 1)

Range nameplate (W)0 if no range. Single household range. Demand from Table 220.55 column C.Dryer nameplate (W)0 if no dryer. NEC enforces a 5,000 W minimum if present.Water heater (W)0 if none.Electric heat (W)Resistance heat or strip heat at full output.Air conditioning (tons)1 ton ≈ 3,600 VA. Larger of heat or AC will be used.EVSE charging current (A)0 if none. Continuous load. Gets a 125% multiplier.

Total demand load37045 VA

Service current (240 V)154.35 A

Conductor sizing (83% rule)128.11 A

Recommended service150 A

A 150A service handles this dwelling with the 83% rule applied. If the homeowner is planning a hot tub or pool later, bump the service one size now and save the upgrade trip.

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