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Flow Turbulence Intensity from Reynolds Number Calculator

Re determines laminar vs turbulent flow; I ≈ 0.16 Re^(−1/8).

Calculates the Reynolds number Re = ρvD/μ, classifies the flow regime (laminar Re < 2300, transitional 2300–4000, turbulent > 4000), and estimates turbulence intensity I ≈ 0.16·Re^(−0.125).

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

kg/m³
m/s
m
Pa·s

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Re = ρvD/μ; I ≈ 0.16·Re^(−1/8)

In depth

Calculates the Reynolds number Re = ρvD/μ, classifies the flow regime (laminar Re < 2300, transitional 2300–4000, turbulent > 4000), and estimates turbulence intensity I ≈ 0.16·Re^(−0.125).