Mass Flow Converter

The mass flow rate (ṁ) is the mass that passes a point each second: kilograms of fuel into an engine, grams of air through a sensor, tonnes of material along a conveyor. Its SI unit is the kilogram per second (kg/s).

For a fluid, it follows from the volume flow: ṁ = ρ * Q, the density times the volumetric flow rate. So 2 L/s of water (1 kg/L) is 2 kg/s. Volume flows themselves are converted in the Flow Converter.

How to convert mass flow units

Type a value into any field, and every other unit is calculated at once. For example, an engine's air sensor reading 25 g/s:

1. In kg/min: multiply by 60 for the minutes, and divide by 1,000 for the kilograms.

   25 × 60 / 1,000 = 1.5 kg/min

2. In lb/min: multiply by 0.132277.

   25 × 0.132277 = 3.307 lb/min

There are 3,600 seconds in an hour, so a flow in kg/s times 3,600 gives kg/h: 25 g/s is 0.025 × 3,600 = 90 kg/h.

Common conversions

Mass flow units

• Kilogram / Second (kg/s): The kilogram per second is the standard unit of mass flow rate in the International System of Units (SI), representing one kilogram of mass passing through a point in one second.
  Conversion Factor: 1 kg/s = 60 kg/min = 1,000 g/s = 60,000 g/min = 1,000,000 mg/s = 60,000,000 mg/min = 0.001 t/s = 0.06 t/min = 2.20462 lb/s = 132.277 lb/min

• Kilogram / Minute (kg/min): The kilogram per minute is another unit for mass flow rate, measuring the mass in kilograms passing through a point in one minute.
  Conversion Factor: 1 kg/min = 0.01667 kg/s

• Gram / Second (g/s): The gram per second is a metric unit representing one gram of mass passing through a point in one second.
  Conversion Factor: 1 g/s = 0.001 kg/s = 0.06 kg/min = 60 g/min = 1,000 mg/s = 60,000 mg/min = 0.000001 t/s = 0.00006 t/min = 0.00220462 lb/s = 0.132277 lb/min

• Gram / Minute (g/min): The gram per minute is a metric unit measuring the mass in grams passing through a point in one minute.
  Conversion Factor: 1 g/min = 0.01667 g/s

• Milligram / Second (mg/s): The milligram per second is a smaller metric unit, representing one thousandth of a gram passing through a point in one second.
  Conversion Factor: 1 mg/s = 0.001 g/s = 0.06 g/min = 0.000001 kg/s = 0.00006 kg/min = 60 mg/min = 0.00000220462 lb/s = 0.0001322774 lb/min

• Milligram / Minute (mg/min): The milligram per minute measures the mass in milligram passing through a point in one minute.
  Conversion Factor: 1 mg/min = 0.01667 mg/s

• Ton / Second (t/s): The ton per second is a larger unit, representing one ton of mass passing through a point in one second.
  Conversion Factor: 1 t/s = 1,000 kg/s = 60,000 kg/min = 1,000,000 g/s = 60,000,000 g/min = 60 t/min = 2,204.62 lb/s = 132,277.36 lb/min

• Ton / Minute (t/min): The ton per minute is also a larger unit, measuring the mass in tons passing through a point in one minute.
  Conversion Factor: 1 t/min = 0.01667 t/s = 16.66667 kg/s

• Pound / Second (lb/s): The pound per second is a unit commonly used in the imperial system, representing one pound of mass passing through a point in one second.
  Conversion Factor: 1 lb/s = 0.453592 kg/s = 27.216 kg/min = 453.59 g/s = 27,215.5 g/min = 453,592.4 mg/s = 27,215,500 mg/min = 0.000453592 t/s = 0.027216 t/min

• Pound / Minute (lb/min): The pound per minute is an imperial unit measuring the mass in pounds passing through a point in one minute.
  Conversion Factor: 1 lb/min = 0.01667 lb/s = 0.00755987 kg/s