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 Tell us about your home
Square feet of air-conditioned space. A guess is fine.
2 How do you heat and cool your home?
The boxes outside that hum in the summer.
Not sure which heat source to choose? How to tell them apart
3 Tell us what is powered by electricity in your home
Do not include gas appliances
Tick everything you have, and set a quantity if you have more than one. Your air
conditioning is sized from the square footage, so there is nothing to tick for that.
Recommended for your home
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How load management works
Air-cooled vs liquid-cooled
The detailed numbers
This is a planning estimate, not a quote. It uses typical equipment ratings rather than your exact nameplates. We confirm the final size with an exact load calculation during your free in-home assessment.