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Get Your Standby Generator Size Estimate

Make selections below to see a realistic generator size range for your home.

Disclaimer: This calculator provides estimates only and is not a legal quote. Final generator sizing depends on a real load calculation (especially HVAC starting loads), your electrical panel, fuel type, and code requirements.

Generator Sizing Calculator

As you make selections, your results will update automatically

Home Size

Small 0–1,500 sq ft
Medium 1,500–2,500 sq ft
Large 2,500–3,500 sq ft
XL 3,500+ sq ft

Heating Type

Gas / Propane / Oil Lower electrical heat load
Electric / Heat Pump Higher electrical heat load

Cooling During Outages

No AC Needed Essentials-focused backup
Central AC (1 system) Moderate additional demand
Multiple HVAC Loads Higher starting-load demand

Backup Goal

Essential Circuits Heat, fridge, sump, Wi-Fi, select lights
Whole-Home Feel More comfort loads & simultaneous usage

Optional Loads (Select Any)

Sump Pump / Basement Protection Common priority load in Wisconsin
Well Pump Higher start-up demand
Medical / Critical Equipment Priority reliability
EV Charging During Outage Significant demand (often optional)

Sizing Notes

• HVAC starting loads can materially change sizing recommendations.

• Many homes achieve a “whole-home feel” using load management.

• Final sizing is confirmed with a load calculation + panel evaluation.

Your Generator Estimate

Based on your selections

Make selections in all required categories to see your estimate

Schedule a Generator Consultation

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