About

Flow rate conversion is a daily requirement in Civil Engineering, HVAC sizing, and Chemical Processing. Engineers often face the challenge of converting data sheets listed in Mass Flow (kg/h) to Volumetric Flow (m³/h) for pump sizing. Unlike standard converters, this tool integrates a density database to perform this cross-dimensional calculation instantly.

It handles US and Imperial gallons, standard cubic feet per minute (CFM) for air systems, and metric standards. Correct flow calculations prevent pump cavitation, pipe erosion, and system inefficiency.

Formulas

Volumetric conversions use linear factors. However, converting Mass Flow (ṁ) to Volumetric Flow (Q) requires the fluid density (ρ):

Q = ṁρ

Example: Converting 5000 kg/h of Gasoline (ρ ≈ 740 kg/m³) to m³/h:

Q = 5000740 ≈ 6.757 m³/h

Reference Data

Unit	Symbol	Equivalence (m³/h)	Common Application
Cubic Meter per Hour	m³/h	1.0	Industrial Pumps
US Gallon per Minute	GPM (US)	0.22712	US Water Systems
Liter per Minute	L/min	0.06	Hydraulics, Medical
Cubic Feet per Minute	CFM	1.6990	HVAC, Air Compressors
Liter per Second	L/s	3.6	Waste Water
UK Gallon per Minute	GPM (UK)	0.27276	UK/Legacy Systems

Frequently Asked Questions

Yes. Density changes with temperature. This tool uses standard densities at ~15-20°C. For high-precision thermal fluids (e.g., hot oil at 200°C), you must manually adjust the density value if using the Mass Flow feature.

A US Gallon is ~3.785 liters, while a UK (Imperial) Gallon is ~4.546 liters. Using the wrong GPM unit introduces a ~20% error, which can be critical in pump specification.

The factor is 1 CFM ≈ 1.699 m³/h. This is a volumetric conversion and doesn't depend on air density unless you are converting to mass flow (kg/s).