The HVAC Duct Sizing Calculator helps you determine the appropriate duct size based on the airflow rate and duct shape. You can select the airflow rate in different units (CFM, CMS, LPS) and choose the duct shape (round or rectangular). For round ducts, input the diameter; for rectangular ducts, input the width and height. The calculator provides the duct size in both square feet and square meters.

HVAC Duct Sizer Calculator

Round Duct Diameter (in):

Rectangular Duct Size (Width x Height in):

Velocity (FPM):