Poiseuille's Law
Calculate Poiseuille's Law instantly with the exact formula and a worked example.
Poiseuille's Law
Tube radiusmm
Pressure difference ΔPPa
Tube lengthm
Dynamic viscosity ηmPa·s
Fluid densitykg/m³
Volumetric flow rate
0.392699mL/s
Flow rate
0.023562L/min
Mean flow velocity
0.125m/s
Reynolds number
250
Flow regime
Laminar
More about: Poiseuille's Law
What it calculates
The “Poiseuille's Law” calculator computes Volumetric flow rate in mL/s from 5 parameters: tube radius (mm), pressure difference δp (Pa), tube length (m), dynamic viscosity η (mPa·s), fluid density (kg/m³).
A standard physics formula used in educational and engineering tasks.
Example calculation
With parameters Tube radius = 1 mm, Pressure difference ΔP = 1,000 Pa, Tube length = 1 m, Dynamic viscosity η = 1 mPa·s, Fluid density = 1,000 kg/m³ the result is 0.3927 mL/s (Poiseuille's law applies only to laminar flow (Re < 2300)).
How to use
- Enter tube radius, pressure difference δp, tube length, dynamic viscosity η and fluid density — each field above is adjustable with a slider.
- Volumetric flow rate (mL/s) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Poiseuille's Law calculated?
The Poiseuille's Law calculator computes Volumetric flow rate (in mL/s) from tube radius, pressure difference δp, tube length, dynamic viscosity η, fluid density. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Poiseuille's Law calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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