Duct / cross-section calculator
Calculate the required cross-section and diameter from air flow and velocity.
Diameter (mm)
243
- Cross-section (cm²)
- 463
01
A = V̇ / v
The cross-section is air flow divided by flow velocity.
02
To diameter
From the area, the round diameter follows via d = √(4·A/π).
03
Pick a velocity
Typical duct velocities are 2–5 m/s — higher gets noisy and pressure-heavy.
Rough calculation, no warranty; pressure loss and duct shape are not considered.
From measurement to finished quote
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