Generac Generator Sizing Tool

Home & Service Info

Square Footage

Fuel Type

Service Size

Transfer Switch

Climate

Panel → Generator Run

HVAC Systems

Per Generac Table 1 — 1 kW running per ton A/C

A/C or Heat Pump

# of A/C Units

Elec. Heat Strips

Elec. Water Heater

Install Location

Existing Gas / LP Line?

Loads to Back Up

Check all that apply · use ✂ to shed

⚡ Load Shed Mode — check everything in the house, then click ✂ to exclude non-essential loads and find the minimum generator size.

⚠️ Shed Mode Active. Yellow items are checked but excluded from sizing. They appear in results as shed loads.

NEC Calculated (Auto from Sq Ft)

⚡ Per NEC 220 / Generac method: General lighting & receptacles are calculated at 3 VA per sq ft. Small appliance & laundry circuits are added below as fixed items.

Small Appliance & Fixed Circuits · 1,500 VA each

Kitchen Counter Circuits (min 2)

Laundry Circuits (min 1)

Motor Loads (High Surge)

Fixed Appliances & Large Loads

Pool, Spa & Hot Tub

Optional & Specialty Loads

📊 SIZING RESULTS

⚡

Enter square footage and select your loads, then hit Calculate to get your generator recommendation, material list, and tech tips.

RECOMMENDED GENERAC

-- kW

⚡ Load Shed Mode active — yellow items excluded from sizing.

⚡ NEC Load Summary

NEC Calculated Load (running)--

Peak Surge (largest motor)--

Sheddable Load--

Recommended Generator Size--

🔧 System Specs

📋 Material List

💡 Tech Tips & Notes