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Electrical Load Calculation Basics
Estimate residential electrical load
This guide covers a simple residential load calculation: list circuits and major appliances, apply demand factors, check panel rating, and consult an electrician for close margins or upgrades.
- electrical load
- panel
- circuits
- demand factors
- capacity
List loads
List branch circuits and large loads (HVAC, ranges, EV chargers).
Apply demand factors
Use NEC-style demand factors to estimate diversified load.
Check panel rating
Compare estimated load to main breaker rating; avoid overloading.
Plan upgrades
If near limits, consult an electrician for subpanels or service upgrades.