Poiseuille's Law Calculator

Volumetric Flow Rate (Q):

Radius of pipe (r):

Pressure differecne between two points (Δ P):

Dynamic Viscosity (μ):

Length of pipe (L;):

How This Is Calculated

$$ Q = \frac{\pi r^4 (\Delta P)}{8 \mu L} $$ where:

Q = Volumetric Flow Rate (m³/s)

r = Radius of pipe (m)

Δ P = Pressure differecne between two points (Pa)

μ = Dynamic Viscosity (Pa s)

L = Length of pipe (m)

Assumptions

The fluid is incompressible and Newtonian.
The fluid is in a steady flow.
The flow is laminar.
Flow is in steady-state.
End effects are negligible.

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