# Volumetric Flow Rate Converter (m³/h / L/min / gpm / cfm) Convert volumetric flow rate between m³/h (cubic metres per hour), L/min (litres per minute), gpm (US gallons per minute, 1 gal = 3.785411784 L), and cfm (cubic feet per minute, 1 ft³ = 28.3168466 L). Converts via m³/s to the target unit and also lists the equivalent value in all four units for reference. Used for pumps, HVAC, compressed air, and piping. > Canonical page: https://elysiatools.com/en/tools/flow-rate-volume-converter - **Category:** Math & Numbers - **Keywords:** volumetric flow rate, flow rate conversion, m³/h, cubic metres per hour, L/min, litres per minute, gpm, gallons per minute, cfm, cubic feet per minute, HVAC, pump flow, piping ## Overview Convert non-negative volumetric flow rates between m³/h, L/min, US gpm, and cfm. Enter a value, choose the input and output units, set decimal places from 0 to 10, and receive the selected conversion plus equivalent values in all four units. ## Inputs - **Input unit** (select) - **Value** (number): Volumetric flow value in the selected Input unit. Must be non-negative (flow direction is handled separately). - **Output unit** (select) - **Decimal Places** (number) ## When to use - Convert pump flow rates between L/min, m³/h, and US gpm. - Translate HVAC or air-handling ratings between cfm and m³/h. - Compare flow measurements used in piping, compressed air, and equipment specifications. ## How it works - Enter a non-negative flow value in the Value field. - Select the Input unit and Output unit from m³/h, L/min, gpm, or cfm. - Choose the number of decimal places, from 0 to 10. - The tool converts through m³/s and returns the target value with equivalent values in all four units. ## Use cases - Pump and water-flow specification checks - HVAC and air-handling capacity comparisons - Piping and compressed-air flow calculations ## Frequently asked questions ### Which volumetric flow units are supported? The converter supports m³/h, L/min, US gpm, and cfm. ### Does gpm mean US gallons per minute? Yes. The conversion uses 1 US gallon = 3.785411784 litres. ### What does cfm mean? cfm means cubic feet per minute, using 1 ft³ = 28.3168466 litres. ### Can I control the displayed precision? Yes. Set Decimal Places from 0 to 10; the default is 4. ### Can I enter a negative flow value? No. The Value input must be non-negative; flow direction is handled separately. ## Related tools - [Mass Flow Rate Converter (kg/s / lb/h / t/h)](https://elysiatools.com/en/tools/flow-rate-mass-converter): Convert mass flow rate between kg/s (kilograms per second, SI base), lb/h (pounds per hour, 1 lb = 0.45359237 kg), and t/h (tonnes per hour, 1 t = 1000 kg). Converts via kg/s to the target unit and also lists the equivalent value in all three units for reference. Used for boiler feedwater, chemical dosing, fuel consumption, and compressed-gas metering. - [Spring Compression Energy Calculator](https://elysiatools.com/en/tools/spring-compression-energy): Calculate the elastic potential energy and force of a spring in compression or extension. U = ½·k·x², F = k·x. Solve energy from displacement, or displacement from energy. - [Stress & Strain Calculator](https://elysiatools.com/en/tools/stress-strain-calculator): Calculate engineering stress σ = F/A and engineering strain ε = ΔL/L₀ under uniaxial load. Choose what to solve: for stress, enter force F (N) and cross-section area A (mm²) → result in MPa; for strain, enter original length L₀ and elongation ΔL (negative for compression) → dimensionless ratio. Units are self-consistent (N, mm) so stress comes out directly in MPa. - [Acre to Square Feet](https://elysiatools.com/en/tools/acre-to-square-feet): Convert acres to square feet with configurable decimal precision - [Air Changes per Hour (ACH, n = Q/V)](https://elysiatools.com/en/tools/air-changes-per-hour): Compute the air change rate (ACH / n) of a room from the outdoor supply airflow Q and the room volume V: n = Q/V (1/h). Three modes: solve ACH (given Q and V), solve airflow (given n and V), or solve volume (given n and Q). Flow in m³/s/m³/h/CFM, volume in m³/ft³/L. Also reports the well-mixed single-zone purge time to reach a target residual fraction ε (default 1%): t = −ln(ε)/n hours. - [Bar to PSI](https://elysiatools.com/en/tools/bar-to-psi): Convert bar to pounds per square inch with configurable decimal precision - [Bearing Life L10 Calculator](https://elysiatools.com/en/tools/bearing-life-l10): Calculate the basic rating life of a rolling bearing: L10 = (C/P)^p, with p = 3 for ball bearings and p = 10/3 for roller bearings. When a speed is provided, converts to L10h in operating hours. - [Bernoulli Equation Solver (Velocity / Pressure / Elevation)](https://elysiatools.com/en/tools/bernoulli-equation-solver): Solve the Bernoulli equation p/(ρg) + v²/(2g) + z = const for steady, ideal, incompressible flow between two points on a streamline. Supply all three upstream quantities (p₁, v₁, z₁) and any two of the three downstream quantities; the tool solves for the third. Solve velocity: v₂ = √\[v₁² + 2(p₁-p₂)/ρ + 2g(z₁-z₂)\] — a negative radicand is physically impossible and is rejected. Solve pressure: p₂ = p₁ + ½ρ(v₁²-v₂²) + ρg(z₁-z₂). Solve elevation: z₂ = z₁ + (p₁-p₂)/(ρg) + (v₁²-v₂²)/(2g). g = 9.81 m/s². Density in kg/m³/g/cm³, pressure in Pa/kPa/bar/atm/psi, velocity in m/s, elevation in m/cm/ft. The upstream pressure/velocity/elevation heads and the total head are also reported. ## Samples - [Web Image Processing Python Samples](https://elysiatools.com/en/samples/web-image-processing-python): Web Python image processing examples using PIL/Pillow including reading, saving, resizing, and format conversion - [Android Image Processing Java Samples](https://elysiatools.com/en/samples/android-image-processing-java): Android Java image processing examples including reading/saving images, scaling, and format conversion - [Android Image Processing Kotlin Samples](https://elysiatools.com/en/samples/android-image-processing-kotlin): Android Kotlin image processing examples including reading/saving images, scaling, and format conversion - [Web Image Processing Rust Samples](https://elysiatools.com/en/samples/web-image-processing-rust): Web Rust image processing examples including image read/save, scaling, and format conversion ## Related content - [HVAC Load, Airflow, Refrigeration, and Thermal Comfort Review](https://elysiatools.com/en/hubs/hvac-load-airflow-refrigeration-comfort): Estimate HVAC loads, airflow, psychrometric states, refrigeration conditions, heat-transfer effects, and thermal comfort for an engineering review.