Reynolds Number Calculator

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Calculates the Reynolds number, a dimensionless quantity that helps predict fluid flow patterns (laminar vs. turbulent).

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Fluid Velocity, Characteristic Length, Fluid Density, and Dynamic Viscosity in the units shown.

Step 2

Read Reynolds Number and Flow Regime in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Fluid Velocity: 1 m/s; Characteristic Length: 0.1 m; Fluid Density: 1,000 kg/m³; Dynamic Viscosity: 0.001 Pa·s

Reynolds Number: 100,000; Flow Regime: Turbulent

Fluid Velocity: 50 m/s; Characteristic Length: 1 m; Fluid Density: 1.225 kg/m³; Dynamic Viscosity: 0.000018 Pa·s

Reynolds Number: 3,402,777.778; Flow Regime: Turbulent

Fluid Velocity: 0.5 m/s; Characteristic Length: 0.05 m; Fluid Density: 1,200 kg/m³; Dynamic Viscosity: 0.1 Pa·s

Reynolds Number: 300; Flow Regime: Laminar

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