Reynolds Number Calculator

Enter atleast three values and click on calculate. Result will be displayed.

Diameter of Pipe:
feet
Specific Weight of Substance:
lb/ft
Viscosity of Substance:
centipoise
Velocity:
ft/sec
Reynolds number:

The Reynolds number (Re) is a dimensionless quantity used to predict flow patterns in different fluid flow situations. It helps determine whether the flow is laminar, turbulent, or in transition.

The formula for calculating the Reynolds number is:

Where:

  • ρ= fluid density (kg/m³)
  • v= velocity of the fluid (m/s)
  • D= characteristic length (diameter of pipe or object) (m)
  • μ= dynamic viscosity of the fluid (Pa·s)