Reynolds Number Calculator

This CalcTown calculator calculates Reynold's number to predict whether the flow of a fluid will be laminar or turbulent.

Reynolds Number Calculator

Diameter of Pipe (D)

Fluid Density (ρ)

Kg/m³

Viscosity of Fluid (η)

N.s/m²

Fluid Velocity (v)

m/s

Result

Reynolds number

where

N_R: 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