DuctSizer Pro

Darcy-Weisbach friction with Colebrook-White iteration. Round, rectangular, and flat oval sizing per SMACNA standards.

Design Parameters
Recommended Size
Enter flow rate to calculate
--
diameter
Velocity
--
FPM
Head Loss
--
in.wc/100ft
Area
--
ft²
Equiv. Dia.
--
in
Vel. Pressure
--
in.wc
Reynolds #
--
 
ρ: 0.075 lb/ft³
f: --
Alternatives:
Custom Size Analysis
Enter a dimension to solve for the other
--
Velocity
--
FPM
Head Loss
--
in.wc/100ft
Area
--
ft²
Equiv. Dia.
--
in