How Much Does It Cost to Run a Bathroom Exhaust Fan?
A bath fan draws about 30 watts — running it 20 minutes after every shower costs almost nothing and prevents expensive moisture damage. At the US-average rate of 16.5¢/kWh, running a bathroom exhaust fan costs about $0.30/month ($3.61/year) at typical use. Adjust the watts, hours, and your rate below for your exact number.
Cost to run a bathroom exhaust fan
$4/yr
- Per day
- $0.01
- Per month
- $0.30
- Energy per year
- 22 kWh
Cost = power (kW) × hours × days × your rate. Defaults are typical values — enter your appliance's actual watts (often on a label) and your real rate for a precise figure.
How much electricity does a bathroom exhaust fan use?
At 30 W for 2 hours a day, a bathroom exhaust fan uses about 0.1 kWh per day — roughly 2 kWh per month and 22 kWh per year. That's about 1% of the 863 kWh the average US home uses in a month. Energy use is the same everywhere — only the price per kWh changes your bill.
Wondering about the circuit instead? See how many amps a bathroom exhaust fan draws.
Cost to run a bathroom exhaust fan by electricity rate
Same 30 W appliance, 2 h/day — the bill changes with where you live.
| Scenario | Rate | Per month | Per year |
|---|---|---|---|
| Cheapest states (North Dakota) | 11.5¢ | $0.21 | $2.52 |
| US average | 16.5¢ | $0.30 | $3.61 |
| Most expensive (Hawaii) | 42.9¢ | $0.78 | $9.39 |
Find your state's rate on the electricity rates by state page, or see the appliance wattage chart for more devices.
Measure what a bathroom exhaust fan really costs you
The estimate above uses typical wattage and hours. This load is usually hardwired or on a 240 V circuit, so a plug-in meter won't fit it; a whole-home monitor's sensors clip onto the circuit's wires inside the panel and log its real kilowatt-hours. That means working in a live panel — hire an electrician if that isn't you.
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Whole-home energy monitor
Emporia Vue 3 Home Energy Monitor (16 circuit sensors)
Best for: Measuring hardwired and 240 V loads, or every circuit at once
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