Pipe Velocity from Flow Rate Calculator

Average velocity from Q and diameter

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Pipe Velocity from Flow Rate

Average velocity from Q and diameter

$$v = \dfrac{4Q}{\pi D^2}$$

Average cross-sectional velocity for fully developed pipe flow. Feeds directly into Re and Darcy-Weisbach.

Q (m³/s)

D (m)

Both fields required; D nonzero.

Average Velocity v

—m/s

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