CFM Calculator

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Calculates the required airflow in cubic feet per minute (CFM) for a room based on its dimensions and desired air changes per hour.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Room Length (feet), Room Width (feet), Room Height (feet), and Air Changes per Hour (ACH) in the units shown.

Step 2

Read Room Volume (cubic feet) and Required CFM in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Room Length (feet): 10; Room Width (feet): 10; Room Height (feet): 8; Air Changes per Hour (ACH): 6

Room Volume (cubic feet): 800 cubic feet; Required CFM: 80 CFM

Room Length (feet): 18; Room Width (feet): 15; Room Height (feet): 9; Air Changes per Hour (ACH): 4

Room Volume (cubic feet): 2,430 cubic feet; Required CFM: 162 CFM

Room Length (feet): 12; Room Width (feet): 10; Room Height (feet): 8; Air Changes per Hour (ACH): 8

Room Volume (cubic feet): 960 cubic feet; Required CFM: 128 CFM

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