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Reynolds Number Calculator

Fluid Velocity:
Fluid Density:
Pipe Diameter (or Distance):
Fluid Viscosity:
Reynolds Number:
     

Note: Reynolds Number is dimensionless.

Reynolds Number formula:
  NR = ρ * v * D / η
where:
  NR: Reynolds Number, dimensionless
  ρ: Fluid Density, in Kg/m^3
  v: Fluid Speed (velocity), in meter/second
  D: Pipe Diameter (travelled length of the fluid; hydraulic diameter in river system), in meter
  η: Fluid Viscosity, in N.s/m^2

Velocity converter

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Viscosity dynamic converter

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