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 Household Appliance Energy Use

Listed below are some common appliances, their wattage and an estimate of operating costs. There is also a simple formula for calculating operating costs below.

Appliance

Watts

Hours/Mo

kWh/Mo

Avg. $/Mo

Air Conditioner (Room) 6,000 BTU

750

120 - 720

90 - 540

6.75 - 40.50

Air Conditioner (Room) 9,000 BTU

1050

120 - 720

126 - 756

9.45 - 56.70

Air Conditioner (Central) 2.5 Tons

3500

240 - 860

850 - 3000

63.75 - 225.00

Can Opener

175

1/12 - 1

.01 - .18

.00 - .01

Ceiling Fan

60

15 - 330

1 - 20

.08 - 1.50

Clock

5

720

4

.30

Clothes Dryer

5000

6 - 28

30 - 140

2.25 - 10.50

Clothes Washer, Automatic (With Electric Water Heating)

500

7 - 40

33 - 196

2.48 - 14.70

Clothes Washer, Automatic (With Non-Electric Water Heating)

500

7 - 40

3 - 16

.23 - 1.20

Coffee Maker

900

4 - 30

4 - 27

.30 - 2.03

Computer (Monitor & Printer)

200

25 - 160

5 - 32

.38 -2.40

Dehumidifier

350

120 - 720

42 - 252

3.15 - 18.90

Dishwasher (With Electric Water Heating)

1300

8 - 40

20 - 102

1.50 - 7.65

Dishwasher (With Non-Electric Water Heating)

1300

8 - 40

3 - 16

.23 - 1.20

Drill

300

3 - 7

1 - 2

.08 - .15

Electric Blanket

180

30 - 90

5 - 16

.38 - 1.20

Electric Heater (Portable)

1200

30 - 90

30 - 90

2.25 - 6.75

Fan (Portable)

115

18 - 52

2 - 6

.15 - .45

Food Blender

390

3 - 5

1 - 2

.08 - .15

Food Freezer (15 cu. ft.)

335

180 - 420

60 - 140

4.50 - 10.50

Frying Pan

1150

10 - 20

12 - 23

.90 - 1.73

Furnace Fan Motor (Intermittent)

350

160 - 415

56 - 145

4.20 - 10.88

Furnace Fan Motor (Continuous)

350

720

252

18.90

Hair Dryer (Portable)

1000

1 - 10

1 - 10

.08 - .75

Heating Pad

65

15 - 30

1 - 2

.08 - .15

Humidifier (Portable)

100

80 - 540

8 - 54

.60 - 4.05

Iron (Hand)

1000

1 - 10

1 - 10

.08 - .75

Lighting Single Lamp (60W)

60

17 - 200

1 - 12

.08 - .90

Compact Fluorescent (60W Equiv)

18

17 - 200

.3 - 3.6

.02 - .27

Ceiling Fixture (3 bulbs)

180

6 - 195

2 - 35

.15 - 2.63

Tri-Light (Table Lamp)

100

10 - 200

1 - 20

.08 - 1.5

Chandelier (5 Lamp)

300

10 - 183

3 - 55

.23 - 4.13

Fluorescent (2 Tube 4 ft.)

100

10 - 200

1 - 20

.08 - 1.50

Microwave Oven

1300

5 - 30

5 - 30

.38 - 2.25

Power Saw

275

2 - 4

.6 - 1

.05 - .08

Range

12500

10 - 50

125 - 625

9.38 - 46.88

Range (Self Cleaning Cycle Only)

3200

1/2 - 1 1/2

2 - 5

.15 - .38

Refrigerator-Freezer Frost Free (17 cu. ft.)

500

150 - 300

75 - 150

5.63 - 11.25

Refrigerator (Non Frost Free - 13 cu. ft.)

300

190 - 300

56 - 90

4.20 - 6.75

Sewing Machine

75

4 - 14

.3 - 1

.02 - .08

Stereo

30

1 - 170

0.03 - 5.1

0.01 - 0.38

Television

180

60 - 440

5 - 35

.38 - 2.63

Toaster

1150

1 - 3.5

1 - 4

.08 - .30

Toothbrush

10

1 - 2

.01 - .02

.00

Vacuum Cleaner (Portable)

800

2 - 6

2 - 5

.15 - .38

Video Cassette Recorder

40

50 - 200

1 - 8

.08 - .60

Water Bed Heater

400

150 - 300

60 - 120

4.50 - 9.00

Water Heater Typical Family of 4

3800

98 - 138

375 - 525

28.13 - 39.38


In order to calculate the average operating cost for any electrical appliance you can use the following formula:

watts/1000 = kW x hours of operation = kWh x kWh rate = cost

Watts can usually be found on the appliance nameplate. If the nameplate lists amps:

volts x amps = watts

Example:  How much does it cost to operate my portable electric heater? An electric heater wattage is usually given on the unit itself, or with the literature that comes with it.  Our example is 1000 watts. I use the heater an average of 45 hours during winter months (1/2 hour per day for the three winter months). The City of Ames Electric Services electric rate during the winter is $.068.  So -

1000 watts/1000 = 1 kW x 45 hours of operation = 45 kWh x $.068 = $3.06

Now we have an 8 amp heater. The calculation changes just a bit:

8 amps x 120 volts household current = 960 watts/1000 = .96 kW x 45 hours = 43.2 kWh x $.068 = $2.94

 

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Last modified: April 10, 2017