What Size Generator Do I Need?

Check the things you want to keep running when the power goes out. We will give you a rough size.

Whole house (check everything)

Essentials

Comfort

Central air conditioner (pick one)

No central AC 2 ton (small home) 3 ton (average home) 4 ton (large home) 5 ton (very large home)

Not sure? Look on the outdoor unit label.

Kitchen and Laundry

Have a licensed electrician confirm your size

Morningstar Electric LLC | Lic# EC13005732

Estimate only. This is not a professional load calculation. Real needs depend on your home and equipment. A licensed electrician should confirm your size with a load calculation. Most areas require a permit for a home standby generator.

Estimate only — not engineering, legal, or code-compliance advice. Same math as the calculator on morningstarelectricllc.com, with your own utility rate. Electrical sizing must be verified with a load calculation per the adopted NEC and the local AHJ. Default prices (EIA/AAA, Nov 2026) change often. Use is subject to the Terms of Use & Disclaimer. — Morningstar Electric LLC