Free CFM calculator for HVAC airflow measurement. Calculate cubic feet per minute (CFM) for rectangular and round ducts. Enter air velocity and duct dimensions for instant results.
Calculate Cubic Feet per Minute (CFM) of airflow based on duct dimensions and air velocity.
Calculation Formula
CFM = Air Velocity (FPM) × Area (sq ft)
CFM = 1000 × (1 × 1)
CFM = 1000 × 1.0000
CFM = 0.00
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