// multi-utility computation suite · offline · instant · precise
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eng.venturi-meter-flow Calculator
Calculates flow rate through a Venturi meter from pressure differential and geometry using the Bernoulli principle. Venturi meters are preferred over orifice plates for dirty fluids because the smooth convergence avoids solid deposition — they have lower permanent pressure loss.
Inputs
Upstream Diameter Mm
Internal diameter of the pipe. Larger diameter reduces velocity and pressure drop but increases material cost.
Throat Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Pressure Diff Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Fluid Density Kg M3
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
flow rate Q (L/s)
Flow rate Q — the volume of fluid passing a point per unit time.
flow rate Q (m³/s)
Flow rate Q — the volume of fluid passing a point per unit time.
throat velocity (m/s)
The value at the specified point or condition.
upstream velocity (m/s)
Reference formula or conversion factor shown for context.