Volumetric Flow Rate Converter

Volumetric Flow Rate Converter — GPM, LPM, m³/h, CFM Online

The Volumetric Flow Rate Converter is a free online tool that converts between every common flow rate unit: gallons per minute (GPM, US and Imperial), liters per minute (LPM), cubic meters per hour, cubic feet per minute (CFM), liters per second, barrels per day, and many more. Whether you are sizing pumps, designing HVAC ducts, evaluating fuel flow, or calculating water consumption, this converter delivers accurate answers in one click.

Why Flow Rate Conversion Matters

Different industries use radically different flow units. US plumbers think in GPM, European engineers prefer m³/h, HVAC professionals use CFM for air, oil & gas measures in barrels per day, and laboratory equipment lists mL/min. A pump that says 50 GPM is wildly different from one labeled 50 L/min — mixing units when sizing pipes, valves, and motors can cause undersized systems, overflows, or inadequate cooling. The Volumetric Flow Rate Converter eliminates this error by handling every common unit.

How to Use the Converter

Enter your flow rate value, select the source unit, and choose the target unit. The conversion appears instantly with full precision. The tool handles tiny laboratory flows (μL/min) and massive industrial flows (m³/s), with scientific notation support where helpful.

Common Use Cases

Plumbers and HVAC contractors size pipes and ducts. Mechanical engineers calculate pump capacities. Oil and gas analysts compare production rates. Lab technicians configure liquid handling equipment. Students complete fluid mechanics homework. The tool is free, runs entirely in your browser, mobile-friendly, and requires no signup.

Tamer Baghdadi

CEO / Co-Founder