Reynolds Number Calculator

Calculate the Reynolds number and determine flow regime characteristics using fluid dynamics principles

Flow Velocity(Speed of fluid)

Characteristic Length(Pipe diameter or channel width)

Fluid Density(kg/m³)

Fluid Viscosity(Pa·s for dynamic, m²/s for kinematic)

Common Fluid Properties (20°C):

Water: 1000 kg/m³, 0.001 Pa·s

Air: 1.2 kg/m³, 0.000018 Pa·s

Oil: 900 kg/m³, 0.03-0.1 Pa·s

Blood: 1060 kg/m³, 0.003 Pa·s

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Quick Tips

1Use consistent units throughout calculations
2Consider significant figures in results
3Document experimental conditions
4Verify results with control calculations