Reynolds Number Calculator

Density (kg/m³):

Velocity (m/s):

Characteristic Length (m):

Dynamic Viscosity (Pa·s):

Reynolds Number: —
Flow Regime: —

Enter the Density of the fluid in kg/m³.
Enter the Flow Velocity in m/s.
Enter the Characteristic Length (e.g., pipe diameter) in meters.
Enter the Dynamic Viscosity in Pa·s (e.g., water is about 0.001 Pa·s at room temperature).
Click “Calculate.”
- The script computes the Reynolds number.
- It also displays whether the flow is Laminar (Re < 2300), Transitional (2300 ≤ Re ≤ 4000), or Turbulent (Re > 4000).

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