Pipe Flow Rate Calculator — Volumetric Flow from Velocity

Calculate volumetric flow rate from flow velocity and pipe diameter. Convert between flow rate units and size pipes for your application.

Fluid Velocity (m/s)
Pipe Diameter (m)
Kinematic Viscosity ν (m²/s)
Common ν: Water 20°C = 1.004×10⁻⁶ · Air 20°C = 1.516×10⁻⁵ m²/s
⟨∿⟩ Fluids Reference: All calculations use SI units (Pa, m³/s, W, K). Moody friction factor uses Blasius smooth-pipe approximation. Bernoulli assumes ideal, incompressible, steady flow along a streamline.
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How It Works

Calculate volumetric flow rate from flow velocity and pipe diameter. Convert between flow rate units and size pipes for your application

Each component has a specific meaning:

  • Flow velocity — The flow velocity recorded for the patient or scenario being assessed.
  • Pipe diameter — The pipe diameter recorded for the patient or scenario being assessed.

Note: Interpret the pipe flow rate result against the clinical thresholds and context described above.

How to Use

Enter the flow velocity, pipe diameter for the patient or scenario you are assessing. Calculate volumetric flow rate from flow velocity and pipe diameter. Convert between flow rate units and size pipes for your application. Use the pipe flow rate result to inform your clinical assessment.

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Frequently Asked Questions