Dwelling Load Calculation

One-family dwelling, 120/240 V. Standard method (NEC 220 Part III) or Optional method (220.82). Service size per 230.79(C) and conductors per 310.12 (83%).

General loads

Living area (sq ft) Small-appliance circuits Laundry circuits Range / cooktop+ovens (kW) Dryer nameplate (W, 0 = gas) Water heater (W) Dishwasher (VA) Disposal (VA) Microwave/hood (VA) Other fixed (VA, comma list)

Heating & cooling

A/C or heat pump compressor (VA) Electric heat / heat strip (VA) Heat pump? Separately controlled heat units Largest motor (VA) for 25% Pool pump / EV / other (VA)

Standard method: heat and A/C are noncoincident (220.60) — only the larger is counted. Water heater, dishwasher, disposal, microwave and "other" are fixed appliances (75% when 4 or more, 220.53). EV chargers are not part of 220.53 — enter them in "Pool pump / EV / other" at 100% (or 125% if you want to be conservative). Optional method applies to services 100 A and larger.

Reference only — not engineering, legal, or code-compliance advice. Results are estimates for qualified persons and must be verified against the NEC edition adopted where the work is done (your selected edition), manufacturer instructions, and the local AHJ. Use is subject to the Terms of Use & Disclaimer. — Morningstar Electric LLC