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Bath Fan Calculator

4 Steps to Finding the Correct Bath Fan CFM

Bath Fan CFM Calculator

ft.
Step 1: Enter Bathroom Width
ft.
Step 2: Enter Bathroom Length
ft.
Step 3: Enter Bathroom Height

Step 4: Press Calculate

* Minimum suggested Bath Fan CFM

Suggested CFM for the bathroom is based on cycling all the air in the bathroom 8 times per hour. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. The higher the bath fan rating the more air can be vented out of the bathroom, which means less moisture and mold build-up. Other options for bath fans include lights, heaters, and even humidity sensors. Continue shopping bath exhaust fans to find a right fan for your budget, size, and style.

Bathroom Fan CFM Guide

Making sure the bath fan is powerful enough for the bathroom, is important to minimizing moisture and mold. Below are examples of bath fan CFM ratings.

Other factors: Consider a stronger bath fan if your bathroom includes any of the following: Whirlpool tub, steam shower, high humidity locations,  or if your bathroom is in a particularly cold climates. These factors and feature can produce excess moisture in the shower and bath.

Bath fans low CFM

50 CFM Fan

Bath Fans 100 CFM

100 CFM Fan

Bath Fans 150 cfm

150 CFM Fan

Bath Fans 50 CFMBath Fan 100 CFMBath Fans 150 CFM

Featured Bath Fans with Heaters

NuTone 9093WH
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Broan QTX110HL
  • Broan QTX110HL
  • 110 CFM 0.9 Sone Ceiling Mounted HVI Certified Bath Fan with Light and Night Light
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