Electrical Tools

Electrical Load Calculator

Calculate dwelling unit load per Article 220 NEC. Includes general lighting, appliances, HVAC, and demand factors.

Dwelling Unit Specifications

NEC Article 220 Calculation

Total Load 0 VA
Service Size 0 A
General Lighting (3 VA/sq ft) 0 VA
Small Appliance (1500 VA × 2) 3000 VA
General Lighting Demand (First 10kW) 0 VA
Appliance Demand 0 VA
HVAC/Heat (Larger of two) 0 VA
Recommended Service 0 A

NEC 220.82 (Optional)

  • Gen Lighting: 3 VA/sq ft
  • 1st 10kW: 100%
  • Remainder: 40%
  • Appliances: 75% demand
  • HVAC/Heat: 100% of larger

Standard Sizes

Residential: 100A, 150A, 200A, 320A, 400A

100A: Up to ~15kW load

200A: Most single family

400A: Large homes

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