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Authorized National Distributor
for the SMC Corporation of America

Authorized National Distributor for SMC
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Airflow Conversion

Airflow Unit Conversion

Enter the air velocity or volume airflow and the duct area, then select the appropriate units.
Clicking the calculate button without input will load the example below. Calculations are approximate.
Velocity Units
Volume Airflow Units

Airflow Value



ft/min (LFM)
miles/hr (MPH)
ft3/min (CFM)

Choose circular tubing or rectangular piping and type the required dimension(s), then select the appropriate units.



Using the airflow calculator above, type the airflow value of 400 and select LFM as the units. Next type the circular duct dimensions of r = 2 in. After pressing the Calculate Airflow button, read the CFM requirement of 34.91 CFM in the volume airflow units column.
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