Wattage Calculator
Generator Wattage Sizing Calculator
Generator Wattage Sizing Calculator
Select the appliances you plan to run at the exact same time during an outage to estimate your power needs.
⚠️ Do not select every appliance you own. Only select the items you will power simultaneously to avoid overestimating.
Refrigerator/Freezer700W / 2200W
0
Microwave (1000W)1000W / 1000W
0
Coffee Maker1000W / 1000W
0
Toaster850W / 850W
0
Dishwasher1200W / 1500W
0
Electric Oven/Range2500W / 2500W
0
Crock Pot200W / 200W
0
Blender400W / 850W
0
Electric Griddle1500W / 1500W
0
Deep Fryer1500W / 1500W
0
Air Fryer1500W / 1500W
0
Chest Freezer500W / 1500W
0
Washing Machine500W / 2250W
0
Electric Clothes Dryer5400W / 5400W
0
Gas Clothes Dryer700W / 2500W
0
Electric Water Heater4500W / 4500W
0
Clothes Iron1200W / 1200W
0
Well Pump (1/2 HP)800W / 2100W
0
Sump Pump (1/2 HP)800W / 2100W
0
Window AC (10k BTU)1200W / 3600W
0
Window AC (15k BTU)1800W / 5400W
0
Central AC (2 Ton)3800W / 11400W
0
Central AC (3 Ton)6000W / 18000W
0
Humidifier200W / 200W
0
Dehumidifier650W / 650W
0
Space Heater1500W / 1500W
0
Furnace Blower (1/3 HP)700W / 1400W
0
Furnace Blower (1/2 HP)800W / 2350W
0
Box Fan100W / 100W
0
LED/LCD TV100W / 100W
0
Plasma TV300W / 300W
0
Laptop Computer50W / 50W
0
Desktop Computer300W / 300W
0
Gaming Console200W / 200W
0
Laser Printer600W / 600W
0
Modem/Router20W / 20W
0
Smartphone Charger10W / 10W
0
LED Bulb (x1)10W / 10W
0
Incandescent Bulb (x1)60W / 60W
0
Corded Drill600W / 900W
0
Circular Saw1400W / 2300W
0
Table Saw1800W / 4500W
0
Air Compressor (1 HP)1500W / 4500W
0
Shop Vac1000W / 1500W
0
Bench Grinder1400W / 2500W
0
Belt Sander1200W / 2400W
0
RV AC (13.5k BTU)1500W / 3500W
0
RV Refrigerator200W / 200W
0
Hair Dryer1500W / 1500W
0
AM/FM Radio50W / 50W
0
Total Running Watts:
0 W
+
Total Starting Watts:
0 W
(Includes highest starting wattage)
Frequently Asked Questions
Running watts (or rated watts) are the continuous power an appliance needs to operate. Starting watts (or surge watts) provide a brief 2-3 second burst of extra power needed to start motor-driven appliances like refrigerators or air conditioners.
Add up the running watts of all the appliances you want to run *at the same time*. Then add the single highest starting wattage from that list. This total is your minimum required starting wattage.
If your generator is undersized, it will overload and shut down. This can potentially damage both the generator and your connected appliances.
It depends on your house size and the generator capacity. Small to medium portable generators (3,000-8,000W) are best for essential circuits. To power an entire home with central AC and major appliances, you typically need a standby generator or a very large portable unit (10,000W+).