Service Size Calculator

Calculate minimum service size per NEC Article 220 standard method.

Building Type

Floor Area (sq ft)

Small Appliance Circuits (20A kitchen/dining)

Laundry Circuit (20A)

Electric Range (kW)

Electric Dryer (kW)

Water Heater (kW)

A/C or Heat Pump (tons)

Results

Enter building loads to calculate service size.

100A: Small homes, apartments

150A: Medium homes

200A: Large homes, standard new construction

320A: Large homes with high loads

400A: Very large homes, small commercial