Flow Velocity Calculator — Velocity from Flow Rate & Area

Calculate flow velocity from volumetric flow rate and pipe or channel area. Convert between velocity units and check design limits.

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 flow velocity from volumetric flow rate and pipe or channel area. Convert between velocity units and check design limits

Each component has a specific meaning:

  • Volumetric flow rate — The volumetric flow rate recorded for the patient or scenario being assessed.
  • Pipe or channel area — The pipe or channel area recorded for the patient or scenario being assessed.

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

How to Use

Enter the volumetric flow rate, pipe or channel area for the patient or scenario you are assessing. Calculate flow velocity from volumetric flow rate and pipe or channel area. Convert between velocity units and check design limits. Use the flow velocity result to inform your clinical assessment.

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Frequently Asked Questions