Electricity calculator
Ceiling Fan Cost Calculator
Estimate the monthly cost of running a ceiling fan from watts, daily hours, days, and kWh rate.
When to use this calculator
Use this calculator to see how little or how much a ceiling fan adds to a monthly electric bill. Fans usually cost far less than air conditioning, but long daily use still adds up.
A fan cools people by moving air; it does not lower room temperature like AC. The best savings come from using the fan to feel comfortable at a higher thermostat setting, then turning it off when the room is empty.
Formula used
Fan kWh = watts ÷ 1,000 × hours per day × days. Cost = kWh × rate.
The formula is intentionally simple so it can be used for quick planning. Real bills, quotes, and installation costs can include fixed fees, taxes, tiers, labor, product limits, and site-specific conditions that a calculator cannot see.
Input guide
| Input | How to use it |
|---|---|
| Fan watts | Use the fan label, manual, or a measured value. |
| Hours per day | Only count hours when the fan is actually useful. |
| Days | Use the monthly billing period or seasonal plan. |
| Rate | Use your electricity price per kWh. |
Examples
Normal use
A 70 W fan for 8 hours daily over 30 days uses 16.8 kWh.
AC support
Using a fan with a slightly higher AC thermostat can reduce cooling cost, but the fan alone should not run in empty rooms.
How to get a more accurate result
- Different fan speeds use different power.
- Lights attached to the fan should be counted separately if they are used.
- Compare fan cost with AC running cost to see the bigger picture.
Common mistakes to avoid
- Leaving fans on in empty rooms.
- Counting the fan as a room-cooling device instead of comfort airflow.
- Ignoring attached light kits.
Quick checklist before relying on the result
- Find fan wattage.
- Estimate speed and hours.
- Use local kWh rate.
- Turn fans off when rooms are empty.
FAQ
Does a fan cool the room?
No. It cools occupants through airflow, not the air itself.
Is a ceiling fan expensive to run?
Usually no compared with AC, but cost depends on wattage and hours.
Should I include the fan light?
Yes if the light is on; add its wattage separately.