Air Flow Unit Conversion

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

Height

Width

inftmmcmm

Radius

inftmmcmm

Airflow Value

Velocity Units

Volume Airflow Units

LFMm/sMPHCFMm^3/hrL/s

ft/min (LFM)

m/s
miles/hr (MPH)

ft³/min (CFM)
m³/hr

L/s

Example

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.