Mass Flow Rate Converter

Convert mass flow rate values among common SI, metric and customary units. Mass flow rate describes how much mass passes a point per unit time. It is independent of fluid density until you translate between mass and volume flow.

ValueEnter zero or a positive value; scientific notation is accepted.Convert fromKilogram per second (kg/s)Kilogram per minute (kg/min)Kilogram per hour (kg/h)Gram per second (g/s)Pound per second (lb/s)Pound per minute (lb/min)Short ton per hour (ton/h)Convert toKilogram per second (kg/s)Kilogram per minute (kg/min)Kilogram per hour (kg/h)Gram per second (g/s)Pound per second (lb/s)Pound per minute (lb/min)Short ton per hour (ton/h)

Convert

Converted value3.674371036 lb/min

SI-base value0.02777777778 kg/s

Multiply by0.03674371036

The displayed results apply to the default example. Enable JavaScript to convert other values.

How to use this converter

1. Enter the mass flow rate value.
2. Select its current unit and the unit you want.
3. Select Convert. The page shows the converted value, the SI-base value and the direct multiplication factor.

Conversion formula

Converted value = entered value × source-to-SI factor ÷ target-to-SI factor.

Every option is represented by its factor to kilogram per second (kg/s). This one-base method keeps reciprocal conversions consistent. Calculations run in your browser, and old results are hidden when an input changes or validation fails.

Worked example

Convert 100 kg/h to lb/min. Multiply by 0.03674371036; the result is 3.674371036 lb/min. The same input equals 0.02777777778 kg/s in the SI-base unit.

Accuracy and limitations

This converter does not infer volume flow, pipe size or pressure loss. Those require density and system conditions.

The calculator retains more digits internally than it displays. Round the final value to the precision supported by your measurement. Very large and very small answers may use scientific notation.

Frequently asked questions

Can I convert mass flow directly to gallons per minute?

Not without fluid density. The same mass occupies different volumes for different fluids and conditions.

Can I reverse the conversion?

Yes. Swap the From and To selections. Because both units use the same SI base, the reverse factor is the reciprocal of the forward factor.

Why was my entry rejected?

Use digits with an optional decimal point or scientific notation. Blank values, commas, fractions, words and non-finite entries are rejected. Negative values are rejected because this converter treats the quantity as a magnitude.

Review notes and sources

Reviewed October 4, 2026. The conversion factors, default example, zero or signed boundary behavior, invalid-input handling and recovery after an error were checked. Factors follow SI definitions and published conversion guidance from the NIST Guide to the SI and the BIPM SI Brochure. Explanations and examples are original.

Related calculators

Conversion calculators · Companion calculator · Related calculator · Search all calculators