Generator Sizing Calculator
Find the Exact Generator Capacity Your Home Requires
Guessing your generator size leads to overpaying for extra capacity or underpowering essentials during an outage.
Using National Electrical Code guidelines (NEC 220.82), our calculator estimates your running load and motor-starting surge requirements. Select your home size, cooling systems, and essential appliances to get your recommended kilowatt rating instantly.
1 Your home
2 Central air conditioning
3 Heating
4 Everyday essentials
5 Large loads
Recommended for your home
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This is a planning estimate based on the National Electrical Code (NEC 220.82) optional method for dwellings, using typical wattage values. Your final generator size is confirmed with an exact load calculation during your free in-home assessment. Estimates assume 120/240V single-phase residential service.