So, it’s time for a new bathroom fan. You are wondering how much airflow (CFM) you need?
I have created this helpful calculator that will tell you exactly how much CFM you need.
Just use the sliders to enter the size of your bathroom and you are ready to go!
CFM – Cubic feet per minute
If the calculator is not working try refreshing the page.
If you need additional help choosing your new bathroom fan, check out my guide with 6 easy steps to finding the right bathroom fan.
My recommendations for 50 CFM bathroom exhaust fans
My recommendations for 100-110 CFM bathroom fans
Panasonic FV-0511VQC1 Whisper Sense DC fan with dual sensor
- Motion sensor, humidity sensor
- Adjustable delay timer
- Pick-A-Flow speed selector 50, 80 or 110 CFM
- ECM motor, < 0.3, < 0.3, < 0.3 sone
Last update on 2026-07-14 / Affiliate links / Images from Amazon Product Advertising API