Reynolds Number Calculator
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Calculate the Reynolds number for fluid flow, which determines whether the flow is laminar, transitional, or turbulent.
Using density (ρ) and dynamic viscosity (μ)
Flow Properties
Fluid Properties
kg/m³
kg/(m·s)
Reynolds Number Results
Reynolds Number (Re)
6.8474e+6
Turbulent Flow
Velocity
100.00 m/s
360.00 km/h ≈ 194.384 knots
Characteristic Length
1.00 m
100.00 cm ≈ 3.28084 ft
Fluid Properties: Air
Density (ρ)
1.225 kg/m³
Dynamic Viscosity (μ)
1.7890e-5 kg/(m·s)
Kinematic Viscosity (ν)
1.4604e-5 m²/s
ν = μ/ρ
Open Source & Transparent
This tool is open source and the underlying logic is fully transparent. You can view the source code, understand the calculations, and even contribute improvements to make it better for everyone.
View Source Code