Service Load Calculation (Residential)

Standard demand factors over lighting, appliances, range, dryer, HVAC; output minimum service ampacity.

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Formula and source

Standard method per NEC 220.42 (general lighting demand factors) and 220.82 (optional dwelling-service); appliance loads per NEC 220.53.

NEC 2023 (NFPA 70). Article 220.

Audience

This tile is built for electricians and the adjacent professions in the Electrical group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.