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💨 CFM Calculator
Calculate CFM (cubic feet per minute) for room ventilation. CFM = room volume × air changes per hour ÷ 60.
How to Calculate CFM for Ventilation
CFM (cubic feet per minute) measures airflow rate. The formula is: CFM = Room Volume (cu ft) × Air Changes per Hour (ACH) ÷ 60. Room volume = length × width × ceiling height. The required ACH depends on the room type and use.
Recommended Air Changes per Hour
Bathroom: 8 ACH. Kitchen: 15–20 ACH. Bedroom: 5–6 ACH. Living room: 4–6 ACH. Workshop/garage: 6–10 ACH. Server room: 10–15 ACH. Restaurant kitchen: 20–30 ACH. These values ensure adequate ventilation for air quality, moisture control, and occupant comfort.
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