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💨 Bathroom Exhaust Fan Cost Calculator

Estimate the cost to install a bathroom exhaust fan. Choose basic, light combo, or light+heater combo based on bathroom size and duct run length.

Project Details

Bathroom Size (sq ft)

Multiply length × width; standard bathroom is 40–80 sq ft

Fan Features (1 = basic, 2 = fan+light, 3 = fan+light+heater) ()

1 = ventilation only, 2 = adds ceiling light, 3 = adds 1500W heater — great for cold bathrooms

Duct Run Length (ft)

Distance from fan to exterior vent cap through attic or wall

Your Estimate

Enter your details and hit Calculate to see results.

Recommended Tools & Supplies

Cut the ceiling opening for the fan housing — score then cut cleanly

Prepare electrical connections — always turn off the breaker first

Verify power is off before touching any wiring in the junction box

Editorial picks. Links go to Amazon — we may earn a small commission at no extra cost to you.

Pro Tips

✓ Size the fan by CFM: multiply bathroom sq ft by 1.1 (e.g., 60 sq ft = 66 CFM minimum; round up)
✓ Vent to exterior ONLY — never into an attic. Attic moisture causes mold and structural damage
✓ Use rigid metal duct for runs over 5 ft; flexible duct traps more lint and reduces airflow
✓ A combination fan+light+heater replaces two or three fixtures — saves space and electrical runs
✓ Look for Energy Star certified fans — they're quieter and cost less to run

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