Generator Wattage Calculator for appliances and devices

From Consumer Reports:

The first step in choosing a generator is finding one that will supply enough power for your home.

You’ll need to know the average wattage for most household appliances and devices so you can calculate your needs.

When you’ve lost power at your home, you probably will not run every appliance or device–generators are intended to temporarily provide for your basic needs during an emergency situation.

Household Appliance / Wattage

Air conditioner 
Central 5,000
Room 1,000
Clock radio 10
Coffeemaker 1,050
Clothes washer 425
Clothes dryer (electric) 3,400
Dishwasher 1,800
Dehumidifier 785
Electric blanket 80
Ceiling 120
Window 150
Furnace 750
Whole house 500
Freezer (stand-alone) 600
Hair dryer 1,600
Heating 1,125
central, gas furnace 400
central, oil furnace 1500
electric, portable 1125
Clothes iron 1,400
Light bulb
Incandescent 100
Compact fluorescent 25
Microwave oven 925
Personal computer 
CPU & Monitor 125
Laptop 25
Stereo 250
Range (electric) 4,500
Sump pump 600
Television (color) 
20-inch (LCD) 65
26-inch (LCD) 110
36- to 42-inch (Plasma) 250
50- to 60-inch (Plasma) 340
Toaster 1,100
Toaster oven 1,225
Vacuum cleaner 1,225
Well pump (deep well) 70

Note: After you have the total wattage calculated, increase that figure by 20 percent. [multiply your total by 1.2 to add 20 percent more.] That the figure compensates for differing wattage ratings among appliances and devices; it also accounts for the fact that the circuit breakers on a generator tend to shut off power before maximum load is reached, a move designed to protect the wiring.
Note: if you are not able to do the math to calculate your wattage needs, Consumer Reports’ online calculator may be used.