Exhaust Fan CFM Calculator

Do you need to calculate the CFM of your exhaust fan? The Exhaust Fan CFM Calculator is here to assist you. By entering values such as room dimensions and air changes per hour, you can quickly find the required CFM for your fan.

Exhaust Fan Calculator

Enter the following values to calculate power consumption:

What is Exhaust Fan CFM?

CFM stands for Cubic Feet per Minute. It measures the volume of air an exhaust fan can move in a minute. Calculating the CFM helps ensure proper ventilation and air quality in a space.

How to calculate Exhaust Fan size

How to Use the Calculator

Enter Room Dimensions:

  • Length (in feet)
  • Width (in feet)
  • Height (in feet)

Enter Desired Air Changes per Hour (ACH):

More Calculators
  • Example: ACH = 6

Input these values into the calculator to find the CFM.

Formula

The formula to calculate CFM for an exhaust fan is:

\text{CFM} = \frac{\text{Room Volume (ft³)} \times \text{ACH}}{60}
Variable Description
Length Length of the room in feet
Width Width of the room in feet
Height Height of the room in feet
ACH Air Changes per Hour
CFM Cubic Feet per Minute

How To Calculate Exhaust Fan CFM

Example 1

Input:

  • Length = 10 ft,
  • Width = 12 ft,
  • Height = 8 ft,
  • ACH = 6

Calculation:

    1. Room Volume  = Length × Width × Height = 10 × 12 × 8 = 960 ft³
    2. CFM = (960 × 6) / 60
    3. CFM = 96

Result: 96 CFM

Example 2

Input:

  • Length = 15 ft
  • , Width = 10 ft,
  • Height = 9 ft,
  • ACH = 8

Calculation:

    1. Room Volume = Length × Width × Height = 15 × 10 × 9 = 1350 ft³
    2. CFM = (1350 × 8) / 60
    3. CFM = 180

Result: 180 CFM

I hope you find the Exhaust Fan CFM Calculator useful. How was your experience? If you encounter any issues, please report them on our “Report an Error” page.

 
 
 

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