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Froude Number Open-Channel Flow Calculator

Fr = v / √(g·L) — subcritical vs supercritical flow.

Calculates the Froude number for open-channel flow from flow velocity, gravitational acceleration, and characteristic length (hydraulic depth).

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Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Fr = v / √(g·L); Fr < 1 subcritical, Fr > 1 supercritical

In depth

Calculates the Froude number for open-channel flow from flow velocity, gravitational acceleration, and characteristic length (hydraulic depth).