Electrical Load Calculator

Calculate the total electrical load for a home or building using NEC demand factors. Determine the minimum service panel size needed and compare options to find the right fit for your electrical system.

General Loads

Home Square Footage

Kitchen Circuits (qty)

Laundry Circuit (W)

Appliance Loads

Air Conditioning (W)

Electric Range (W)

Electric Dryer (W)

Water Heater (W)

Other Loads (W)

Panel Pricing (edit to match local rates)

100A Panel ($)

150A Panel ($)

200A Panel ($)

400A Panel ($)

Total Connected Load

37,500 W

Before demand factors

Demand Load

37,200 W

After NEC demand factors

Minimum Service

155A

At 240V service

Recommended Panel

200A Panel

$2,400.00

Purchase Option	Quantity	Est. Cost
100A Panel	INADEQUATE	$1,200.00
150A Panel	INADEQUATE	$1,800.00
200A PanelBest value	23% headroom	$2,400.00
400A Panel	61% headroom	$5,500.00

Recommended: 200A Panel ($2,400.00)A 200A service panel is the minimum adequate size for your 155A calculated demand load, providing 23% headroom for future expansion.

Heavy electrical load detectedYour calculated load of 155A is substantial. Ensure all large appliances are on dedicated circuits and consider load-shedding controls if adding future loads like EV charging.

This calculator provides estimates based on simplified NEC demand factor calculations. Actual service sizing depends on local codes, specific appliance nameplate ratings, and future load planning. Always consult a licensed electrician for final panel sizing.