Electrical Service Load Calculator

NEC Article 220 standard method, simplified — single-family dwelling, 240V service.

Simplified estimator, not a load calc for permit submission. Real service load calculations must follow the full NEC Article 220 method (including Table 220.55 for ranges and Table 220.53 for appliance demand factors) and be performed or verified by a licensed electrician.

General & Small Loads

Heated / Living Area (sq ft)

Small Appliance Circuits

Laundry Circuit

Fixed Appliances (VA)

Dryer

Range / Oven

Water Heater

Other Fixed Appliances (total VA — dishwasher, disposal, etc.)

HVAC & EV

HVAC Load (larger of heating or cooling, VA)

EV Charger (VA, 0 if none)

Breakdown

General Load (demand)

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Fixed Appliances (demand)

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HVAC

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EV Charger

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Estimated Minimum Service

— amps → suggested panel size