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Mass Flow Rate Converter

Convert between kg/s, lb/min, and other mass flow rates.

Convert Units

From:

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Result:

Decimals

All units

Select a unit to convert to it.

Convert mass flow rate measurements between kilogram per second, pound per minute, metric ton per hour, and more.

What is Mass Flow Rate Converter?

Mass flow rate measures how much mass of a substance passes through a cross-section per unit time. Unlike volume flow rate, it is independent of pressure and temperature changes — making it the preferred measurement in chemical engineering, combustion, HVAC, and fuel systems.

Understanding the Units

Kilogram per second (kg/s)

The SI unit of mass flow rate.

Common Uses: Scientific and engineering calculations, turbines, compressors

Pound per minute (lb/min)

Imperial mass flow rate unit.

Common Uses: US industrial processes, HVAC, refrigeration

Conversion: 1 kg/s ≈ 132.277 lb/min

Metric ton per hour (t/h)

Metric ton (1,000 kg) per hour.

Common Uses: Mining, heavy industry, bulk material conveying

Conversion: 1 kg/s = 3.6 t/h

Common Mass Flow Rate Conversions

Example	Mass Flow Rate
Human breathing (at rest)	~6 L/min of air ≈ 0.12 g/s = 0.43 kg/h
Car engine at 100 km/h	~7 L/h of petrol ≈ 5.2 kg/h = 0.0015 kg/s
Industrial steam pipe	10–100 kg/s
Amazon River	~200,000 m³/s ≈ 200,000 t/s water flow

Conversion Formulas

Mass flow rate = Density × Volume flow rate (ṁ = ρ × Q)
Mass flow rate = Mass ÷ Time (ṁ = m/t)
kg/s to lb/min: lb/min = kg/s × 132.277
kg/s to t/h: t/h = kg/s × 3.6
t/h to kg/s: kg/s = t/h ÷ 3.6

Practical Examples

Natural gas pipeline: flow measured in kg/s to account for pressure variation

Large rocket engine: consumes ~400 kg/s of fuel and oxidiser at launch

Air conditioning system: airflow in kg/s determines cooling capacity

Chemical reactor: precise mass flow ratios ensure correct reaction stoichiometry

When to Use Each Unit

kg/s: Engineering calculations, scientific work, international standards

lb/min: US industrial processes, HVAC, refrigeration systems

t/h (tonnes/hour): Mining, bulk material handling, heavy industry

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