Flow Rate Converter — L/min, GPM & CFM

Convert between liters per minute, US gallons per minute, cubic feet per minute, and m³/h.

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How this conversion works. Every rate is converted through m³/s (SI) using exact US gallon and cubic-foot definitions from NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Cubic meter per second (m³/s) or Cubic meter per hour (m³/h).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Cubic foot per second (ft³/s) included.

Frequently asked questions

How do I convert us gallon per minute to liter per minute?

1 us gallon per minute = 3.78541 liter per minute. Choose "US gallon per minute (GPM)" as From and "Liter per minute (L/min)" as To, type a value, and the result updates instantly.

How many L/min is 1 GPM?

1 US GPM = 3.785 L/min exactly (the US gallon definition). A typical shower head flows 1.8–2.5 GPM, or about 7–9.5 L/min.

Is CFM a mass or volume flow?

Volume. CFM is cubic feet per minute of air at actual conditions; SCFM references standard temperature and pressure so it can act as a mass proxy. This tool converts the volumetric value.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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