Deep Cycle Marine Battery

Box Fan Wattage: How Many Watts and Amps Does a Box Fan Use?

Box fans are a very popular type of cooling fans, ranging from small, just a few inches in size units suitable for DIY cooling and ventilation projects, to 20+ inches box fans suitable for larger rooms and smaller spaces.

Since box fans may operate for hours, day after day, many people wonder how much does a box fan cost to run.

Published: June 24, 2021.

box fan w300px

Most popular box fans are smaller 7-10 inches units that are used as personal cooling devices - such units are usually placed on the flat surface near the person, usually on the desk, and larger 18-20 inches box fans that are placed usually on the floor and keep even larger rooms cooler and more pleasant to be in.

Note: Box Fans and other fans, in general, do NOT decrease the temperature of the air they blow/exhaust - cooling is done by the evaporation of the moisture from human skin, which is more intensive as the air passes faster over the skin.

On average, smaller box fans (≤10 inches) require 25-30 watts at the maximum air speed setting, while larger box fans (20 inches) require on average 80-100 watts, although they range from 50 to 200 watts.

For actual wattage of your device, the best thing to do is to check the fan's label, usually placed on the back side or on the bottom of the unit, and/or check the Owner's Guide.

20-Inch Box Fan Wattage Comparison Chart

The following comparison chart lists some of the most popular 20-inch box fans and their wattage at maximum speed (box fans are ordered alphabetically):

Box Fan Model Wattage
Comfort Zone CZ200A 20" 3-Speed Box Fan 75W
Genesis G20BOX-BLK 20" 3-Speed Box Fan 53W
Holmes HBF2001DP-BM 20-Inch Box Fan 100W
Lasko #B20301 20-Inch Premium 3-Speed Box Fan 110W
Lasko Air Flex 2-in-1 20-inch Box Fan and Air Purifier in One 120W

Note: Amazon affiliate links (Box Fan Model column) open in the new windows, feel free to check them for the most up-to-date offers and prices.

Of course, there are many more other 20+ inches box fans on the market, some of them with very interesting features, including remote control, fan + air purifier 2-in-1 design, and similar.

When looking for a new box purifier, be sure to choose according to your own needs and preferences.

Most 20-inch box fans feature at least 2-3 speed settings, allowing the user to decrease the air speed, which also decreases electricity consumption.

For example, if You have a 20-inch box fan rated at 90-100W at maximum speed, one may expect this unit to require 40-50 watts at the lowest setting and 60-75 watts at the medium air speed setting.

≤10-Inch Box Fan Wattage Comparison Chart

The following comparison chart lists some of the most popular ≤10-inch box fans and their wattage at maximum speed (box fans are ordered alphabetically):

Box Fan Model Wattage
Comfort Zone CZ9BWT Portable 9-inch 2-Speed Quiet Box Fan 30W
Optimus F-1022 10" Electric Fan 25W
Polar-Aire S-9PB Mini 9-Inch 3-Speed Box Fan 29W

Note: Amazon affiliate links (Box Fan Model column) open in the new windows, feel free to check them for the most up-to-date offers and prices. 

8-10 inches box fans are even more numerous than the larger ones, so it should be very easy to find one that suits your needs and requirements.

USB Box Fan Watts

USB box fans are small and often stylish-looking fans powered via a USB port on the computer, laptop, or directly from the USB charger.

USB box fans are usually rated below 5 watts (5 Volts, 1 Amp) and are suitable as cooling fans for a single person.

Due to their size, they are very compact units and very quiet and are commonly used even in crowded offices.

Box Fan Electricity Cost

If required, bBox fans can operate all day long and as such, they can increase the electricity bills.

For example, if You have a 20-inch 100W box fan that runs 10h per day at full power, it requires 1 kWh of energy per day.

The price of the average kWh of energy varies, but it is safe to assume that it is below 15 c/kWh.

That means that if You run a 100W box fan 10h per day, its running costs will be 15c/day, which is 4.5 $US per month if such box fan is run every day for 10h.

4.5 $US doesn't sound much, but like everything in life, it adds up.

Similarly, if You have a 10-inch 30W desk box fan that operates 8 hours per day, that would be 240 Wh per day and 7.2 kWh per month, which is ~1.1 $US per month if such a box fan is used every day for 8 hours per day ...

box fan 10 inch w300px

Of course, if a small USB Desk Fan is more than enough for You, You can freely forget about additional electric costs ...


Long Story Short: Box fans can help us feel more comfortable during the summer heat, but in the end, they don't actually decrease the temperature of the air - they help the air circulate, making us feel better.

Larger box fans, if used for longer periods of time, day after day, can increase the electric bills, but not by much.



Amazon Search:

- 20-Inch Box Fan

- 10-Inch Box Fan

- USB Desk Fan

Note: Amazon links open in the new windows, feel free to check them for the most up-to-date offers and prices.

Go to Top