Venturi Flow Meter & Bernoulli Differential Pressure Calculator
Calculate volumetric and mass flow rates, throat velocities, and diameter ratios (beta) from differential pressure across classical Venturi tubes per ISO 5167.
Venturi Geometry & Differential Pressure
mm
mm
kPa
Cd
ISO 5167-4 machined: 0.985 – 0.995
kg/m³
Volumetric Flow Rate (Q)
β = 0.50 (ISO 5167 COMPLIANT)
10.95 L / s
39.4 m³/h (657 L/min)
Mass Flow Rate (ṁ)
10.93 kg / s
39.3 tonnes / hour
Throat Velocity (v2)
5.58 m / s
Inlet velocity (v1): 1.39 m/s
Hydraulic Parameters & Factors
Diameter Ratio (β = d2 / d1):
0.5000
Velocity of Approach Factor (E):
1.0328
Differential Head (Δh):
1.53 m fluid column