Last updated: March 2, 2026 by James Wilson

Volumetric Flow Rate Calculator

Formula

Q = π × (d/2)² × v

Flow rate (Q) is the volume of fluid passing a point per unit time. For pipe flow, Q = A × v = π(d/2)² × v, where d is the pipe diameter and v is fluid velocity. This calculation is essential for plumbing, irrigation, chemical processing, and HVAC systems.

Common use cases:

  • Plumbing pipe sizing
  • Industrial process design
  • Irrigation system planning

Frequently Asked Questions

JW

James Wilson

Licensed Professional Engineer, PE, MS Civil Engineering

James is a Licensed Professional Engineer with a Master's in Civil Engineering and over 12 years of experience in structural design and construction project management. He specializes in building calculations, material estimation, and physics-based engineering tools.

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