Duct Pressure Loss
Estimate duct pressure loss using Darcy–Weisbach + typical fitting losses
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Duct Size
Airflow
Airflow Unit
CFM
m³/h
L/s
Duct Type
Round
Rectangular
Length (m)
Diameter (mm)
Width (mm)
Height (mm)
90° Elbows (qty)
Tees (qty)
Enter airflow + duct size + length to estimate pressure loss.
Uses Darcy–Weisbach (ρ=1.2 kg/m³, galvanized roughness ~0.15 mm). Fittings estimated with typical K values.