Generator Size Calculator – What Size Generator Do I Need?
What Size Generator Do I Need?
Select Your Equipment
Use the quick-start scenarios, search, or expand categories below.
Kitchen
Refrigeration
Refrigerator / Freezer
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Chest Freezer
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Mini Fridge
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Cooking
Microwave Oven
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Electric Oven
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Electric Stove (per burner)
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Air Fryer
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Toaster Oven
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Toaster
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Slow Cooker / Crock Pot
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Electric Grill / Griddle
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Range Hood Fan
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Small Appliances
Coffee Maker
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Blender
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Food Processor
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Stand Mixer
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Cleaning
Dishwasher (Hot Dry)
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Garbage Disposal
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Trash Compactor
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HVAC
Air Conditioning
Central AC (1 Ton / 12k BTU)
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Central AC (2 Ton / 24k BTU)
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Window AC (10,000 BTU)
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Window AC (5,000 BTU)
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Portable AC
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Heating
Furnace Fan Blower (1/2 HP)
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Furnace Fan Blower (1/4 HP)
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Space Heater
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Electric Furnace (10kW)
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Heat Pump
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Air Quality & Fans
Ceiling Fan
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Box Fan
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Dehumidifier
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Humidifier
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Air Purifier
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Electronics & Office
Computers & Peripherals
Desktop Computer
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Gaming PC
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Laptop
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Monitor (LED)
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Internet Modem/Router
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Office Equipment
Laser Printer
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Inkjet Printer
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Copier / Scanner
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Paper Shredder
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Desk Lamp
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Lighting
LED Light Bulb
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Incandescent Bulb
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CFL Bulb
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Fluorescent Light (4-ft)
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Outdoor Flood Light (LED)
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Outdoor Flood Light (Halogen)
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Charging
Phone Charger
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Tablet Charger
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Cordless Tool Battery Charger
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Water, Laundry & Cleaning
Water Systems
Well Pump (1/2 HP)
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Sump Pump (1/3 HP)
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Sump Pump (1/2 HP)
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Electric Water Heater
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Tankless Water Heater (Small)
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Water Softener
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Hot Tub / Spa Heater
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Laundry
Washing Machine
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Electric Clothes Dryer
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Gas Clothes Dryer
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Cleaning Equipment
Vacuum Cleaner (Upright)
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Vacuum Cleaner (Canister)
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Shop-Vac (6 HP)
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Carpet Cleaner
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Steam Cleaner
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Garage, Workshop & Tools
Garage
Garage Door Opener
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EV Charger (Level 1)
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EV Charger (Level 2)
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Air Compressors
Air Compressor (1/2 HP)
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Air Compressor (1.5 HP)
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Air Compressor (2 HP)
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Bench & Stationary Tools
Table Saw (10")
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Miter Saw (12")
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Radial Arm Saw
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Band Saw (14")
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Drill Press
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Bench Grinder (8")
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Jointer (6")
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Planer / Thicknesser
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Wood Lathe
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Scroll Saw
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Handheld Power Tools
Circular Saw (7 1/4")
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Hand Drill (1/2")
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Angle Grinder
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Jig Saw
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Reciprocating Saw
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Orbital Sander
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Belt Sander
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Router
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Soldering Iron
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Heat Gun
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Outdoor & Garden
Lawn & Garden Care
Pressure Washer (Electric)
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Lawn Mower (Electric)
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Leaf Blower (Electric)
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Hedge Trimmer (Electric)
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String Trimmer / Weed Eater
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Electric Chainsaw
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Wood Chipper
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Log Splitter
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Snow Blower (Electric)
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Outdoor Living
Patio Heater
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Bug Zapper
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String Lights (LED)
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Pond / Fountain Pump
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Pool Pump (1 HP)
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Recreation & Entertainment
Home Entertainment
LCD/LED TV (42"-60")
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Plasma TV
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Projector
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Game Console (PS5/Xbox)
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Stereo System / Receiver
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Subwoofer
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DVD/Blu-Ray Player
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RV / Camping
RV Air Conditioner
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RV Refrigerator
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RV Microwave
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RV Water Pump
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RV Converter/Charger
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Hobby & Fitness
Treadmill
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Elliptical Machine
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Sewing Machine
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Electric Keyboard
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Guitar Amplifier
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Personal, Medical & Security
Personal Care
Hair Dryer
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Curling Iron / Flat Iron
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Electric Shaver
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Medical Equipment
CPAP Machine
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Oxygen Concentrator
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Nebulizer
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Stair Lift
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Security
Security System
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Security Camera System (DVR)
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Heavy & Construction
Welding & Cutting
Welder (220V MIG)
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Welder (110V MIG)
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Plasma Cutter (50 Amp)
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Abrasive Cut-off Saw
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Concrete & Masonry
Concrete Mixer (Electric)
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Jackhammer / Breaker Hammer
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Rotary Hammer Drill
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Concrete Saw / Demo Saw
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Tile Saw (Wet)
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General Construction
Industrial Fan
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Halogen Work Light
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Paint Sprayer (Airless)
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Drywall Texture Sprayer
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Transfer Pump (1/2 HP)
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Can't find an item? Add it here.
Your Power Needs
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Required Starting Watts
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Recommended Generator Size
Select appliances to see a recommendation.
Wattage values are estimates. Always check your appliance's label for exact figures.
Generator Size Comparison
Understand the options to make the right choice for your needs.
Small Inverter
Under 2,200 W
Best For: Camping, tailgating, small electronics, chargers.
Pros: Very quiet, portable, clean power for sensitive electronics.
Cons: Limited power output, not for large appliances.
Medium Portable
3,000 - 7,500 W
Best For: Emergency home backup (fridge, sump pump), RVs, job sites.
Pros: Good balance of power and portability, can run essentials.
Cons: Louder than inverters, heavy, requires manual setup.
Large Portable
7,500 - 12,000 W
Best For: Powering multiple home circuits, well pumps, small central AC.
Pros: High power output, can run most of a house, often has 240V outlets.
Cons: Very heavy, high fuel consumption, loud.
Home Standby
12,000 W+
Best For: Whole-house power, seamless automatic backup.
Pros: Automatic operation, powers everything, safer (no extension cords).
Cons: Expensive, requires professional installation.
