Box Fan electricity cost calculator
In this example, a box fan at 75W and 100% duty cycle costs $0.014 per scheduled hour. At 8.00 hours per day, that is $3.32 per 30.44 use days, using the August 2026 US average of 18.16¢/kWh. Adjust the calculator for your appliance and electricity bill.
Box Fan electricity cost calculator
Use watts and running time, or enter energy from a label, meter or completed load. Your inputs stay on this device.
Enter a number within each field’s limits to calculate your cost.
Your estimated energy cost
219 kWh across 365 use days per year
Power mode includes your selected duty cycle. The monthly figure assumes 30.44 use days; the annual total uses your selected use days. These are estimates at the entered rate.
Energy charges only. Fixed utility fees, purchase, installation and maintenance are excluded. See the calculation method and sources.
Running cost at different usage times
These examples hold 75W, 100% duty cycle and 18.16¢/kWh constant. They illustrate the arithmetic, not recommended schedules. Follow the manufacturer’s operating instructions.
| Hours per use day | kWh per day | Cost per day | 30.44 use days |
|---|---|---|---|
| 4 | 0.300 kWh | $0.05 | $1.66 |
| 8 | 0.600 kWh | $0.11 | $3.32 |
| 12 | 0.900 kWh | $0.16 | $4.98 |
| 24 | 1.800 kWh | $0.33 | $9.95 |
How to estimate your box fan electricity use
Box-fan running cost is usually a straightforward wattage-times-hours calculation, but the speed setting matters. Use the actual electrical draw for low, medium or high speed rather than assuming all settings use the nameplate maximum.
These examples assume a constant 75W draw. They are calculated scenarios, not measurements of a particular fan.
- For an illustrative steady 75W fan, eight hours uses 0.6 kWh. At $0.20/kWh that costs $0.12.
- Running the same 75W draw for 24 hours uses 1.8 kWh and costs $0.36 at that illustrative rate. Thirty days at this schedule costs $10.80; the calculator monthly equivalent in watts-and-hours mode uses 30.44 days.
- Set duty to 100% for steady operation during the selected hours. If a timer shuts the fan off, reduce the hours or the duty fraction, not both for the same off-time.
- Use the actual number of seasonal use-days when estimating annual fan cost.
Calculation and data sources
Daily kWh = watts ÷ 1,000 × hours × duty cycle ÷ 100. Multiply kWh by your rate in dollars per kWh to get cost. The wattage, hours and duty cycle above are editable example assumptions, not EIA measurements of this appliance.
The US and state average prices come from the EIA for August 2026. A state average is a starting point; your bill is the better source for your tariff.
Electricity running cost by state
Sorted by average electricity price. These reference figures use 8.00 hours per day at 100% duty cycle, for 30.44 days per month and 365 days per year. Seasonal use will cost less than this year-round scenario. Click a state to load its rate.
| State | Rate /kWh | Per month | Per year | Relative |
|---|---|---|---|---|
| Nevada | 12.72¢ | $2.32 | $27.86 | |
| Louisiana | 12.87¢ | $2.35 | $28.19 | |
| Utah | 13.31¢ | $2.43 | $29.15 | |
| North Dakota | 13.31¢ | $2.43 | $29.15 | |
| Idaho | 13.37¢ | $2.44 | $29.28 | |
| Tennessee | 13.42¢ | $2.45 | $29.39 | |
| Nebraska | 13.54¢ | $2.47 | $29.65 | |
| Kentucky | 13.80¢ | $2.52 | $30.22 | |
| Arkansas | 14.37¢ | $2.62 | $31.47 | |
| Wyoming | 14.43¢ | $2.64 | $31.60 | |
| Mississippi | 14.43¢ | $2.64 | $31.60 | |
| Washington | 14.63¢ | $2.67 | $32.04 | |
| Oklahoma | 14.82¢ | $2.71 | $32.46 | |
| North Carolina | 14.95¢ | $2.73 | $32.74 | |
| Florida | 14.99¢ | $2.74 | $32.83 | |
| Arizona | 15.05¢ | $2.75 | $32.96 | |
| South Dakota | 15.15¢ | $2.77 | $33.18 | |
| Kansas | 15.47¢ | $2.83 | $33.88 | |
| Montana | 15.57¢ | $2.84 | $34.10 | |
| South Carolina | 15.76¢ | $2.88 | $34.51 | |
| Georgia | 15.90¢ | $2.90 | $34.82 | |
| Texas | 15.91¢ | $2.91 | $34.84 | |
| Oregon | 15.92¢ | $2.91 | $34.86 | |
| Missouri | 16.02¢ | $2.93 | $35.08 | |
| West Virginia | 16.31¢ | $2.98 | $35.72 | |
| Alabama | 16.33¢ | $2.98 | $35.76 | |
| New Mexico | 16.51¢ | $3.02 | $36.16 | |
| Indiana | 17.02¢ | $3.11 | $37.27 | |
| Iowa | 17.06¢ | $3.12 | $37.36 | |
| Colorado | 17.17¢ | $3.14 | $37.60 | |
| Minnesota | 17.20¢ | $3.14 | $37.67 | |
| Virginia | 17.64¢ | $3.22 | $38.63 | |
| Delaware | 18.70¢ | $3.42 | $40.95 | |
| Illinois | 19.32¢ | $3.53 | $42.31 | |
| Ohio | 19.38¢ | $3.54 | $42.44 | |
| Wisconsin | 19.41¢ | $3.55 | $42.51 | |
| Maryland | 21.40¢ | $3.91 | $46.87 | |
| Pennsylvania | 21.77¢ | $3.98 | $47.68 | |
| Michigan | 22.99¢ | $4.20 | $50.35 | |
| Vermont | 23.84¢ | $4.35 | $52.21 | |
| Connecticut | 24.51¢ | $4.48 | $53.68 | |
| New Jersey | 24.61¢ | $4.49 | $53.90 | |
| District of Columbia | 25.98¢ | $4.74 | $56.90 | |
| New Hampshire | 27.64¢ | $5.05 | $60.53 | |
| Rhode Island | 28.18¢ | $5.15 | $61.71 | |
| New York | 28.65¢ | $5.23 | $62.74 | |
| Alaska | 29.41¢ | $5.37 | $64.41 | |
| California | 29.75¢ | $5.43 | $65.15 | |
| Massachusetts | 30.48¢ | $5.57 | $66.75 | |
| Maine | 32.11¢ | $5.86 | $70.32 | |
| Hawaii | 47.18¢ | $8.62 | $103 |
Common questions
How much electricity does a box fan use?
In this example, 75 watts at a 100% duty cycle uses 0.075 kWh per scheduled hour. At 8.00 hours per day, that is 0.600 kWh per use day. Your model and operating conditions can differ.
How much does it cost to run a box fan for an hour?
The default example costs $0.014 per scheduled hour at the US average of 18.16¢/kWh for August 2026. This includes the selected duty cycle. Enter your watts, duty cycle and electricity price for your own estimate.
Does the annual cost assume I use it every day?
The reference tables use 365 days at the stated daily hours; monthly figures use 30.44 days. These are comparison scenarios, not forecasts. For a heater used on 90 days, enter 90 use days per year in the calculator.
Why does electricity running cost vary by state?
For August 2026, the EIA state averages range from 12.72¢/kWh in Nevada to 47.18¢/kWh in Hawaii. Equal electricity use costs more at a higher rate. Your utility tariff can differ from the state average.
How much does a box fan cost to run 24/7?
At an illustrative constant 75W it uses 1.8 kWh per day. Multiply by your electricity rate; at $0.20/kWh that is $0.36 per day or $10.80 over 30 days.
How do I calculate a box fan on low speed?
Enter the watts specified or measured at low speed, together with your hours and price per kWh. Do not assume the highest-speed wattage applies to every setting.
Why is the monthly calculator result slightly above a 30-day example?
In watts-and-hours mode, the monthly equivalent uses 30.44 days. A 30-day example uses exactly 30 days; both use the same daily energy formula.