Froude Number Calculator
Compute the Froude number Fr = v/√(gL).
Input Data
Velocity
m/s
Depth
m
Results
Fr = v/√(gL).
0.903
At a glance:Fr = v/√(gL); Fr<1 subcritical, =1 critical, >1 supercritical. Complements critical-depth and reynolds-number.
Formula
Fr = v / √(g·L).
$$Fr = \dfrac{v}{\sqrt{g\,y}}$$How to Use
- Enter velocity and depth.
- The tool returns Fr.
Case Studies
v=2, L=1, g=9.8
Fr ≈ 0.64 (subcritical).
FAQ
Fr=1?
Critical flow — minimum specific energy for the discharge.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.