Reynolds Number Calculator
Determine if flow is laminar or turbulent.
Calculate
--
Enter next fieldEsc clear
Formulas
Re = ρvD / μDimensionless ratio of inertial to viscous forces
Reynolds Number
Re < 2300: Laminar. 2300-4000: Transitional. > 4000: Turbulent. Water at 20°C: ρ=998 kg/m³, μ=0.001 Pa·s. Air: ρ=1.2, μ=1.8×10⁻&sup5;.