Ceiling Fan Electricity Cost Calculator
Enter your appliance data and electricity tariff to calculate energy use and cost. Example inputs are editable.
Enter your values and select Calculate.
Calculates motor and lighting separately; their hours may overlap. Use the motor power at your chosen speed. Energy charges only; fixed fees and taxes are excluded unless included in your rate. Use one currency consistently. Decimal point or comma accepted; no thousands separators.
Calculation formula
Daily kWh = (motor watts × fan hours + light watts × light hours) / 1000. Period energy = daily energy × days. Period cost = period energy × price per kWh.
Use the wattage for your ceiling fan's actual speed, and add the light kit separately if it is not included in the measurement. As an example, a 45 W motor running eight hours uses 0.36 kWh. A separate 18 W light used four hours adds 0.072 kWh.
Calculate your electricity cost with your own watts, hours and tariff.
Motor watts, light watts and airflow
ENERGY STAR identifies motor and blade design as factors in fan efficiency. Compare the airflow delivered along with power consumption; a lower watt number alone does not establish that two fans provide the same service. If the manufacturer's table gives several speeds, use the row matching your setting rather than the maximum rating for all operating hours.
A fan and light on different schedules
With the illustrative 45 W fan and 18 W light above, total daily energy is 0.432 kWh. Over 30 identical days that is 12.96 kWh, costing $2.59 at an assumed $0.20/kWh. If the light is already included in a measured whole-fixture value, do not add it a second time.
Six examples of power, time and electricity cost
Illustrative motor-only average power and daily run time. These figures are not assigned to particular blade diameters or AC/DC motor types. The $0.20/kWh tariff is illustrative, not a quoted local rate. Calculations use unrounded inputs; displayed results are rounded.
| Input power | Operating time | Energy | Cost at $0.20/kWh |
|---|---|---|---|
| 15 W | 8 hours | 0.120 kWh | $0.024 |
| 25 W | 8 hours | 0.200 kWh | $0.040 |
| 45 W | 8 hours | 0.360 kWh | $0.072 |
| 60 W | 8 hours | 0.480 kWh | $0.096 |
| 75 W | 12 hours | 0.900 kWh | $0.180 |
| 90 W | 12 hours | 1.080 kWh | $0.216 |
Energy (kWh) = average electrical input watts × hours ÷ 1,000. Multiply energy by the actual price per kWh for the energy charge. Include other billing components separately. The watts to kWh calculator handles another duration.
Compare speeds with an operating schedule
If a fan uses an assumed 25 W for six hours and 60 W for two hours, the motor uses 0.15 + 0.12 = 0.27 kWh. Enter the two intervals separately in an appliance inventory, or enter an average 33.75 W over eight hours. Do not combine that average with another speed duty factor. For a permanently wired fan, use existing product information or suitable professional measurement rather than an improvised plug connection.
Use the right inputs in the electricity-cost calculator
Enter one device or add it to a household inventory. When watts already represent the average over your entered hours, use a 100% duty factor. When watts represent an on-state value, use accumulated on-time or an appropriate duty factor, but do not apply both reductions. Keep product ratings, measured results and assumptions distinguishable in your comparison.
Frequently asked questions
Do all 52-inch fans use the same watts?
No. Blade diameter does not specify motor efficiency, speed or light-kit power.
Can I add three light bulbs to the fan's wattage?
Yes, if their input is not already included, using their actual electrical watts and operating hours.
Is a fan's electricity use the same as an air conditioner's?
They perform different functions. Calculate each device from its own input and schedule rather than replacing one load with the other in a cost table.
Technical source
ENERGY STAR's ceiling-fan guidance describes efficient motor and blade designs and provides access to certified models. This calculator's worked scenarios are calculations, not measurements performed on products.
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