General Wattage Chart

How much electricity do household items use?

General Wattage Chart

[ href="accessories.htm" target=""> ] [ General Wattage Chart ]

Please note that the Ranger Universal Inverter will handle no more than a 400 watt AC appliance.

Purchasing 2 Ranger 350-watt batteries will only double the time of usable power, but is still limited to 400 watts AC power through the Ranger UI.

To find out the amount of watts your device uses, simply multiply the Amps times the Volts. (Amperes x Volts = Watts) This information is usually found on the wall charging cord of the device or possibly somewhere on your device. You may have to look up your device online and find the technical specifications or read it in the device’s product manual.

Heating
26,500 watts	Elec. furnace, 2000sf, cold climate
7941 watts	Elec. furnace, 1000sf, warm climate
1440 watts	Electric space heater (high)
900 watts	Electric space heater (medium)
600 watts	Electric space heater (low)
750 watts	Gas furnace (for the blower)
1100 watts	Waterbed heater
450 watts	Waterbed heater (avg. 10 hrs./day)
Cooling
3500 watts	Central Air Conditioner (2.5 tons)
1440 watts	Window unit AC, huge
900 watts	Window unit AC, medium
500 watts	Tiny-ass window unit AC
750 watts	Central AC fan (no cooling)
More efficient cooling
400 watts	Evaporative cooler
350 watts	Whole-house fan
100 watts	Floor or box fan (high speed)
90 watts	52" ceiling fan (high speed)
75 watts	48" ceiling fan (high speed)
55 watts	36" ceiling fan (high speed)
24 watts	42" ceiling fan (low speed)
Major appliances
4400 watts	Clothes dryer (electric)
see sep. page	Washing machine
3800 watts	Water heater (electric)
200-700 watts	Refrigerator (compressor)
57-160 watts	Refrigerator (average)
3600 watts	Dishwasher (washer heats water)
2000 watts	Electric oven, 350°F
1178 watts	Electric oven, self-cleaning mode (takes 4.5 hrs, 5.3 kWh total)
1200 watts	Dishwasher (dry cycle)
200 watts	Dishwasher (no water heating or drying)

Computers (see more about electrical use of computers)
150-340 watts	Desktop Computer & 17" CRT monitor
1-20 watts	Desktop Computer & Monitor (in sleep mode)
90 watts	17" CRT monitor
40 watts	17" LCD monitor
45 watts	Laptop computer
Televisions & Videogames
191-474 watts	50-56" Plasma television
210-322 watts	50-56" LCD television
150-206 watts	50-56" DLP television
188-464 watts	42" Plasma television
91-236 watts	42" LCD television
98-156 watts	32" LCD television
55-90 watts	19" CRT television
45 watts	HD cable box (varies by model)
194 watts	PS3
185 watts	Xbox 360
70 watts	Xbox
30 watts	PS2
18 watts	Nintendo Wii (source)
Other
1440 watts	Microwave oven or 4-slot Toaster
900 watts	Coffee maker
800 watts	Range burner
4 watts	Clock radio
3 watt-hours	Total power stored by an alkaline AA battery. This is to put batteries into perspective. If you could power your clock radio with a AA battery, it wouldn't even last an hour. We have more on batteries on our Guide to Household Batteries.
Wattage varies from model to model! Figures above are examples. See How to Misquote this Website. Data for specific models of appliances is available at the Power Consumption Database.

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1. Electricity ___________________________

2. Electrical use varies from model to model.

3. Some devices use varying amounts of electricity. An easy example is an oven, whose energy use depends on how high you crank it. Perhaps a less obvious example is a washing machine, which effectively uses phenomenally more energy if you wash in hot rather than cold. Then there's the refrigerator, which alternates between periods of full energy use while the compressor is running, and then next to nothing when the compressor shuts off. (To solve this problem for fridges, the calculator lists the average wattage over time, not the higher amount used when the compressor runs.)

4. Most devices don't run 24/7. Therefore the "Hours per Day" and "Days per Month" fields in the calculator are crucial. Even so, you might not have a good idea about how various appliances run. So below we'll discuss which items use the most energy in a typical home. You can also measure a device's usage yourself, which gives you the best information for your own situation.

5.


Heating
26,500 watts	Elec. furnace, 2000sf, cold climate
7941 watts	Elec. furnace, 1000sf, warm climate
1440 watts	Electric space heater (high)
900 watts	Electric space heater (medium)
600 watts	Electric space heater (low)
750 watts	Gas furnace (for the blower)
1100 watts	Waterbed heater
450 watts	Waterbed heater (avg. 10 hrs./day)
Cooling
3500 watts	Central Air Conditioner (2.5 tons)
1440 watts	Window unit AC, huge
900 watts	Window unit AC, medium
500 watts	Tiny-ass window unit AC
750 watts	Central AC fan (no cooling)
More efficient cooling
400 watts	Evaporative cooler
350 watts	Whole-house fan
100 watts	Floor or box fan (high speed)
90 watts	52" ceiling fan (high speed)
75 watts	48" ceiling fan (high speed)
55 watts	36" ceiling fan (high speed)
24 watts	42" ceiling fan (low speed)
Major appliances
4400 watts	Clothes dryer (electric)
see sep. page	Washing machine
3800 watts	Water heater (electric)
200-700 watts	Refrigerator (compressor)
57-160 watts	Refrigerator (average)
3600 watts	Dishwasher (washer heats water)
2000 watts	Electric oven, 350°F
1178 watts	Electric oven, self-cleaning mode (takes 4.5 hrs, 5.3 kWh total)
1200 watts	Dishwasher (dry cycle)
200 watts	Dishwasher (no water heating or drying)
Lighting
60 watts	60-watt light bulb (incandescent)
18 watts	CFL light bulb (60-watt equivalent)
5	Night light
0.5	LED night light
Computers (see more about electrical use of computers)
150-340 watts	Desktop Computer & 17" CRT monitor
1-20 watts	Desktop Computer & Monitor (in sleep mode)
90 watts	17" CRT monitor
40 watts	17" LCD monitor
45 watts	Laptop computer
Televisions & Videogames
191-474 watts	50-56" Plasma television
210-322 watts	50-56" LCD television
150-206 watts	50-56" DLP television
188-464 watts	42" Plasma television
91-236 watts	42" LCD television
98-156 watts	32" LCD television
55-90 watts	19" CRT television
45 watts	HD cable box (varies by model)
194 watts	PS3
185 watts	Xbox 360
70 watts	Xbox
30 watts	PS2
18 watts	Nintendo Wii (source)
Other
1440 watts	Microwave oven or 4-slot Toaster
900 watts	Coffee maker
800 watts	Range burner
4 watts	Clock radio
3 watt-hours	Total energy stored by an alkaline AA battery. This is to put batteries into perspective. If you could power your clock radio with a AA battery, it wouldn't even last an hour. We have more on batteries on our Guide to Household Batteries.
Wattage varies from model to model! Figures above are examples. See How to Misquote this Website. Data for specific models of appliances is available at the Power Consumption Database.

Some devices use a little energy even when they're not on. This is called standby power, or vampire power. In most cases it's not especially significant, but in some cases it can be. My standby power page has more info.

U.S. household energy

U.S. household energy use by appliance

Electrical usage of household items

The chart at right shows how the average home used energy (not just electricity) in 2007.
Total energy stored by an alkaline AA battery. This is to put batteries into perspective. If you could power your clock radio with a AA battery, it wouldn't even last an hour. We have more on batteries on our Guide to Household Batteries.

Wattage varies from model to model! Figures above are examples.

Data for specific models of appliances is available at the Power Consumption Database.

Some devices use a little energy even when they're not on. This is called standby power, or vampire power. In most cases it's not especially significant, but in some cases it can be.

Electrical usage of household items

The chart at right shows how the average home used energy (not just electricity) in 2007. (Dept. of Energy) Of course, heating is a bigger chunk in the winter and air conditioning is a bigger chunk in the summer. For example, AC accounts for 60-70% of the average home's summertime power __________ in Austin. (Austin Energy) Places which aren't as hot in summer don't get a break, because they're generally colder in winter and so more is spent on heating. Below at right is the energy use for an all-electric home in Tallahassee, Florida, which shows that 60% of the energy goes to heating and cooling. (City of Tallahassee)

At the bottom of this page is a chart showing the relative use of various appliances. (DoE) Note that this doesn't really jibe with the pie chart above from the DoE. (Refrigerators and appliances use different amounts in the different charts.) If I can ever find the time, I'll try to make my own chart.

Individual Appliances

At far right is a table listing examples of the wattage of common household appliances.

Appliances that create or remove heat use the most electricity. In the table at right, appliances that make things hot are listed in red and ones that make things cold are listed in blue. As you can see, together they dwarf everything else on the list.

Don't like my table? Here's another table from Generator Sales. Databases which list power data for specific models of products include the Power Consumption Database, and the super-slow More Energy Savings.

Remember that electrical usage varies from model to model, and that the tables on this site are just examples. (See how to misinterpret this website.)

Figuring the use of your own items

The best way to know how much energy your stuff uses is to measure it. You can do that easily with a cheap watt-hour meter, or you can do it for free by timing your electric meter. I explain all this on the page about measuring your electrical use.

A shortcut, though a little less accurate, is to just look at the product's label. Nearly everything you can plug into the wall has a label that says how much electricity it uses. (It may be printed directly into the plastic or metal.) You may have to hunt for the label. It's often located on the bottom or side of the device, or possibly where the power cord enters the unit. If the device is powered with an AC/DC adapter, the electrical rating is usually listed on the adapter itself.

If the label gives only the number of amps and not the number of watts, then just multiply the amps by 120 to get the number of watts. (Amps x Volts = Watts, and most __________. electricity is ~120 volts. So a hot plate rated at 6 amps uses 6 x 120 = 720 watts, on the highest setting. Most other countries use 240 volts instead of 120, so outside of North America and Japan use 240 instead of 120 in your calculations.) Note that if a device is powered by a transformer (one of those great big plugs), then the transformer has converted the electricity from AC to DC, so you need to multiply by the DC voltage, not the AC voltage of 120. For example, if the device says "INPUT 9V, 0.5A", then that's 9 volts x 0.5 amps = 4.5 watts.

You may have noticed that appliances may be labeled 110, 115, or 120 volts. U.S. appliances are actually designed to accept a range of voltages, between 110-120 volts, and the exact voltage coming out of your electrical socket can vary depending on conditions at the power plant and in your own home. Let's just agree that when we say 120 volts, we understand that it's actually a range from 110-120. And just use 120 for your calculations (unless you're outside of North America or Japan, in which case you probably have 220-240 volts).

Your device might actually list a huge voltage range, like 100-240V. That just means that it will work with any country's voltage. For your calculations, use the voltage for the country where you're plugging the device in.

Some important caveats:

1. The amount of electricity listed on the label is the maximum amount that the appliance will ever use. For example, a 300-watt refrigerator will only run at 300 watts when the compressor's running (which is when it makes that humming sound, indicating that it's actually chilling the air inside). Most of the time the fridge just sits there, using only 5 watts or so for its electronics. If the amount of work done by a device varies up and down, then so does its energy use. (e.g., a stereo that can be turned up or down, an oven that can be set at various temperatures, a fridge that sometimes runs and sometimes doesn't, a computer that sometimes spins its various drives and sometimes has to use more of its brainpower, etc.) The label on computers is particularly useless; a computer labeled at 300 watts probably uses only about 100. (More on computers' electrical use.) In just a bit we'll cover how to measure the actual amount of electricity being used by a device

2. Many consumer items are advertised according to their power output, not input. That means the stereo that says 30 watts on the box might actually require 50 watts to make 30 watts of sound (assuming the volume was cranked), and your 900-watt microwave oven might actually use 1400 watts (on its highest setting). That's because all electrical devices are inefficient -- they have to use some extra energy to do what they do.

3. Some devices use energy even when they're not on. (Standby power)

Exercise: Pretend there's an energy crisis and they start rationing electricity. You're given a bonus of 1000 watt-hours of electricity to use because you won a special drawing. If you're choosing between using your stereo or your central air conditioner, how long could you run each? Assume that your stereo uses 30 watts and your AC uses 3500 watts. (see answer)

1000 Wh will run a 30-watt stereo for 1000 / 30 = 33 hours. 1000 Wh will run a 3500-watt AC for 1000 / 3500 = 0.29 hours (17 minutes).

Exercise: The power adapter on your laptop computer says its output is 24V and 1.875 amps. The input specs aren't listed for some reason. What's the maximum number of watts your computer could ever use? (see answer)