What does Reynolds number tell?

Re = ρ v D / μ. Predicts laminar vs turbulent flow. Low Re laminar, high turbulent.

Why the typo in name?

Preserved for backward compatibility with existing URLs and references.

Reynolds Number Calculaor Calculator

Reynolds Number Calculaor - Perform scientific calculations with precision and accuracy.

Reynolds Number Calculator

Predict flow regimes (Laminar vs. Turbulent) for pipes and surfaces

Fluid Velocity (v)

m/s

Internal Diameter (D)

Fluid Properties

Dynamic Viscosity (μ)

Pa·s

Fluid Density (ρ)

kg/m³

Enter flow parameters to determine the Reynolds Number

What is Reynolds Number?

The Reynolds number ($Re$) is a dimensionless quantity used to predict flow patterns in different fluid flow situations. It represents the ratio of inertial forces to viscous forces.

Re = ρvL / μ

Using Dynamic Viscosity

Re = vL / ν

Using Kinematic Viscosity

Critical Values

Pipe Flow

Laminar: Re < 2300
Transitional: 2300 < Re < 4000
Turbulent: Re > 4000

Flat Plate

Laminar: Re < 5×10⁵
Turbulent: Re > 5×10⁵

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