Is this average or maximum velocity?

It reports the bulk mean velocity assuming a uniform circular cross-section and fully filled pipe.

Does it handle rectangular ducts?

No. It assumes a round inside diameter. Convert hydraulic diameter separately if you approximate non-circular passages.

Pipe Velocity Calculator

Mean axial velocity in a circular duct from continuity: v = Q/A with A = πD²/4. Useful for checking velocity targets, Reynolds number inputs, and erosion or noise rules of thumb before detailed analysis.

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So geht's

1Enter volumetric flow rate in your preferred volumetric unit.
2Enter the true inside diameter of the flow passage.
3Review mean velocity in m/s or ft/s.

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Is this average or maximum velocity?: It reports the bulk mean velocity assuming a uniform circular cross-section and fully filled pipe.
Does it handle rectangular ducts?: No. It assumes a round inside diameter. Convert hydraulic diameter separately if you approximate non-circular passages.