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
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.