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Reynolds number calculator

Calculate Reynolds number from density, velocity, diameter, and dynamic viscosity, then classify the flow regime.

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Density ρ (kg/m³)

Velocity V (m/s)

Diameter D (m)

Dynamic viscosity μ (Pa·s)

Reynolds number

Flow regime

Note

Re = ρVD / μ

If ρ = 1000 kg/m³, V = 2 m/s, D = 0.05 m, and μ = 0.001 Pa·s, then Re = 100000 and the regime is turbulent.