Volumetric Flow Rate Converter

What Is Volumetric Flow Rate

Volumetric flow rate measures fluid volume passing through a cross-section per unit time. You express this property in cubic meters per second (m³/s) in SI units. Common units include liters per minute, gallons per minute (GPM), and cubic feet per minute (CFM).

Engineers use flow rate to size pipes, pumps, and valves. HVAC professionals calculate air flow for ventilation systems. Process engineers monitor flow rates for quality control and efficiency optimization.

Flow Rate Formulas

Calculate volumetric flow rate from velocity and area:

Where Q equals volumetric flow rate, v equals fluid velocity, and A equals cross-sectional area.

For a circular pipe:

Example: Water flows at 2 m/s through a 50 mm diameter pipe:

Convert to mass flow rate using density: ṁ = ρ × Q. Where ṁ equals mass flow rate and ρ equals fluid density.

Common Flow Rate Values

Continuity Equation

For incompressible flow, mass conservation gives the continuity equation:

Flow rate remains constant through pipe size changes. Velocity increases when area decreases. This principle governs nozzle and venturi design.

Example: A pipe reduces from 100 mm to 50 mm diameter. If upstream velocity is 1 m/s:

Unit Conversion Factors

Frequently Asked Questions