How to use it
- Enter internal pipe diameter and unit.
- Enter average flow velocity and unit.
- Calculate ideal volumetric flow.
Pipe Flow Calculator
Estimate ideal volumetric flow using a circular area and entered average velocity.
Important: This calculator provides an educational estimate only. It is not plumbing, pump, pressure-vessel, dam, turbine, electrical, flood-safety, installation, engineering, legal, or regulatory-compliance advice.
About the Pipe Flow Calculator
Apply a stated average velocity to the cross-sectional area of a circular pipe.
Formula
Area equals pi times radius squared, and flow Q equals area times average velocity.
Example
A 0.1 m diameter at 2 m/s gives about 0.0157 m³/s or 15.7 L/s.
Notes
This ideal estimate excludes friction, roughness, fittings, pressure loss, viscosity and flow-profile effects.