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Reynolds Number Calculator

Calculate the Reynolds number to determine whether flow is laminar, transitional, or turbulent — the fundamental calculation for all fluid mechanics.

Interactive toolUpdated July 2026

Inputs

Fluid

Flow Velocity (m/s)

Pipe Internal Diameter (mm)

Results

Reynolds Number

74,850

Regimeturbulent

Laminar

Transitional

Turbulent

Re = ρ·v·D/μ = 998 × 1.5 × 0.050 / 1.00e-3

How It Works

Re = (ρ · v · D) / μ

ρ = density (kg/m³), v = velocity (m/s), D = internal diameter (m), μ = dynamic viscosity (Pa·s). Laminar Re < 2300, transitional 2300–4000, turbulent > 4000.

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