Water Flow Rate Calculator

Calculate volumetric flow rate using the Hagen-Poiseuille equation Q = πr⁴ΔP / (8ηL) for laminar flow in cylindrical pipes.

Pipe & Fluid Parameters

Pipe Inner Diameter

Diameter unit

Pipe Length

Length unit

Pressure Drop (ΔP)

Pressure unit

Fluid

Dynamic viscosity η (Pa·s)