Standard method · Article 220 Part III · NEC 2023
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Worked example — for a 2,000 ft² dwelling with one 12 kW range and a 5,000 VA dryer, 240 V, the engine returns:
78 A at 240 V — 18,625 VA demand
How it works. The standard method totals general lighting at 3 VA per square foot, applies the demand factors to that subtotal, then adds the appliance, range, dryer and HVAC loads under their own separate rules. It takes longer than the optional method and frequently returns a larger service, which is why both methods exist.
What this covers: Equal-rated ranges only — see the range hint. HVAC is entered as one pre-resolved figure here; the optional method's calculator resolves 220.82(C) for you.
Educational reference, not code. Based on NEC (NFPA 70) 2023 (220 Pt III). Your state or local AHJ may enforce a different edition or amend it — theirs is the one that counts. No NEC text is reproduced here.