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
Sale
Panasonic WhisperSense Ceiling Mount Bathroom Exhaust Fan with Motion & Humidity Sensors, 50-80-110 CFM, FV-0511VQC1
- Bathroom Vent Fan with Moisture and Motion Sensors: This whisper quiet, Energy Star-certified ventilation fan features motion and moisture sensors for the ultimate in automatic moisture and odor...
- Customizable Airflow: This ultra-slim fan features a revolutionary DC/ECM motor and Pick-A-Flow technology that allows you to select your desired airflow from 50, 80 or 110 CFM at the flip of a switch...
- Easy Installation: Flex-Z Fast Bracket simplifies installation with a single-hinge bracket for easy positioning so you don’t need to access your attic to install the fan and includes options for 4"...
- Explore Our Selection: We offer a wide range of vent fans including fans with LED lights, timers, heaters, and condensation sensors for humidity control, plus installation kits, soffit vents,...
Last update on 2025-07-15 / Affiliate links / Images from Amazon Product Advertising API