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Kinematic Viscosity Calculator

Calculate kinematic viscosity and the Reynolds number it produces in a given pipe.

About Kinematic Viscosity Calculator

Kinematic viscosity combines viscosity and density into the single property that governs flow regime. Viscous oils stay laminar at velocities where water is firmly turbulent. The maximum laminar velocity is often the design target for viscous fluids, because laminar flow has dramatically lower friction loss.

Formula

Kinematic Viscosity

ν = μ ÷ ρ; Re = v D ÷ ν

ν
Kinematic viscosity, sometimes called momentum diffusivity

Worked example

With the default values below, Kinematic Viscosity Calculator returns Kinematic Viscosity of 0.000100000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Dynamic viscosityminimum 0 Pa s
0.089 Pa s
Fluid densityminimum 0.01 kg/m3
890 kg/m3
Flow velocityminimum 0 m/s
1.5 m/s
Pipe diameterminimum 0 m
0.05 m

Results

Kinematic Viscosity
0.000100000 m2/s
Kinematic Viscosity
100.000 cSt
Reynolds Number in That Pipe
750.0
Flow Regime
Laminar
Highest Velocity Still Laminar
4.6000 m/s

Step by step

  1. 1Values used
  2. 2Kinematic Viscosity
  3. 3Kinematic Viscosity= 0.000100000 m2/s
  4. 4Kinematic Viscosity= 100.000 cSt
  5. 5Reynolds Number in That Pipe= 750.0
  6. 6Flow Regime= Laminar
  7. 7Highest Velocity Still Laminar= 4.6000 m/s

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 9 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Kinematic Viscosity calculated?

ν = μ ÷ ρ; Re = v D ÷ ν Kinematic viscosity combines viscosity and density into the single property that governs flow regime. Viscous oils stay laminar at velocities where water is firmly turbulent.

Why does Kinematic Viscosity matter?

The maximum laminar velocity is often the design target for viscous fluids, because laminar flow has dramatically lower friction loss.

What values do I need to enter?

This calculator takes 4 inputs: Dynamic viscosity, Fluid density, Flow velocity, Pipe diameter. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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