Duct Velocity Calculator
Calculate air velocity in round and rectangular ducts
Input Parameters
Velocity Pressure Method
Velocity Formulas:
V = CFM ÷ Area (ft²)
V = 4005 × √VP
Velocity Results
Velocity (from CFM & Area)
1273 FPM
14.5 MPH | 6.47 m/s
Velocity (from Velocity Pressure)
2003 FPM
Duct Properties
Duct Area:113.1 sq inVelocity Pressure:0.1011 in. w.g.Reynolds Number:132629
Noise Assessment
High - Industrial Only
Recommended Max Velocities:
Residential supply:700 FPMResidential return:500 FPMCommercial supply:1200 FPMCommercial return:800 FPMIndustrial:2000+ FPM