Dwelling Service & Load Calculator

Estimate the service size for a dwelling using the NEC Article 220 standard method. Enter living area and the major loads — small-appliance and laundry circuits, fixed appliances, range, dryer, and the larger of heat or AC — to get the calculated load and recommended service.

Dwelling Loads

3 VA/ft² general lighting
≥2, 1500 VA each
1500 VA each
Nameplate sum
≥4 → 75% factor
Larger of two

Calculated Service

Recommended Service150 A
Calculated Load138 A
Total Demand33,125 VA
General Lighting (raw)10,500 VA
Lighting (after demand)5,625 VA
Fixed Appliances (adj.)4,500 VA

Simplified NEC Article 220 standard method (dwelling). Lighting demand: first 3000 VA @ 100%, remainder @ 35%. Verify against a full load calc for permit.

Simplified NEC Article 220 standard method for a single dwelling: 3 VA/ft² general lighting plus small-appliance and laundry circuits, with the lighting demand factor (first 3000 VA @ 100%, remainder @ 35%), a 75% factor on four or more fixed appliances, and the larger of heating vs. air conditioning. This is a planning estimate — run a full, stamped load calculation for permit.

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