Reynolds Number Calculator

Calculate Reynolds number and determine flow regime

Flow Parameters

Velocity (ft/s)

Pipe Inside Diameter (inches)

Fluid Type

Fluid Temperature (°F)

Kinematic Viscosity (ft²/s)

Density (lb/ft³)

Reynolds Number Formula:

Re = V × D / ν

V = velocity, D = diameter, ν = kinematic viscosity

Reynolds Number

136446

Flow Regime

Turbulent

Kinematic Visc.:12.215 × 10⁻⁶ ft²/sDynamic Visc.:23.671 × 10⁻⁶ lb·s/ft²Density:62.40 lb/ft³

Critical Velocity:0.084 ft/sVelocity Ratio:59.32xEntrance Length:10.52 ftFriction Factor:0.01644

195.8 GPM

Critical Reynolds Numbers:

• Laminar: Re < 2,300

• Transitional: 2,300 - 4,000

• Turbulent: Re > 4,000