Venturi Meter Flow Calculator
Calculate flow rate through a venturi meter
About this calculator
The Venturi Meter Flow Calculator determines fluid flow rates through venturi meters using differential pressure measurements. This calculator applies Bernoulli's equation and the venturi principle to compute volumetric or mass flow rates based on upstream and throat pressures, pipe dimensions, and fluid properties. It's essential for engineers, technicians, and operators working with flow measurement systems in industrial processes, water treatment plants, HVAC systems, and petroleum applications where accurate flow quantification is critical for process control and efficiency.
How to use
Enter the upstream and throat diameters of your venturi meter, along with the differential pressure reading between these points. Input fluid density and discharge coefficient (typically 0.95-0.99 for standard venturi meters). The calculator will instantly compute the flow rate using the venturi flow equation, providing results in your preferred units.
Frequently asked questions
What is a typical discharge coefficient for venturi meters?
Standard venturi meters typically have discharge coefficients between 0.95 and 0.99, with 0.98 being commonly used for well-designed meters with smooth transitions.
How accurate are venturi meter flow measurements?
Properly calibrated venturi meters can achieve accuracy within ±1-2% of actual flow rate, making them highly reliable for industrial flow measurement applications.
What pressure drop occurs across a venturi meter?
Venturi meters typically recover 80-95% of differential pressure, resulting in relatively low permanent pressure loss compared to other flow measurement devices like orifice plates.