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Conversions

Flow Rate Converter

Convert between litres per second, litres per minute, cubic metres per hour, GPM, CFM, and more flow rate units instantly.

What is Flow Rate Converter?

A flow rate converter lets you switch between units of volumetric flow rate — the volume of fluid passing a point per unit time. L/s and m³/s are SI-based; m³/h is common in HVAC and industrial processes; GPM (US gallons per minute) is standard in North American plumbing; CFM (cubic feet per minute) in ventilation and compressed air.

How to use

  1. 1 Enter the flow rate value in the Value field.
  2. 2 Select the unit you are converting from in the From dropdown.
  3. 3 Select the unit you want to convert to in the To dropdown.
  4. 4 The result and a full table of all equivalent flow rates appear instantly.
  5. 5 Click the swap button to reverse the conversion.

Formula

converted = input_value * (factor_of_from_unit / factor_of_to_unit), where all factors are expressed relative to litres per second (L/s)

Example calculation

A garden hose typically flows at about 2 GPM = 0.1262 L/s = 7.571 L/min. To convert 500 m³/h to L/s: 500 / 3.6 = 138.89 L/s.

Frequently asked questions

What is the difference between L/s and m³/s?

1 m³/s = 1000 L/s. Cubic metres per second is the SI unit but is very large for most practical applications. Litres per second is more convenient for pump and pipe sizing.

What does GPM stand for?

GPM stands for US gallons per minute, the standard flow unit in North American plumbing and irrigation. 1 GPM ≈ 3.785 L/min ≈ 0.06309 L/s. UK uses imperial gallons (1 imp gal = 4.546 L), so always clarify which gallon is meant.

What is CFM used for?

CFM (cubic feet per minute) is the standard unit for HVAC airflow, vacuum pumps, and compressor output in the US. To size a room's ventilation, engineers calculate the required air changes per hour and convert to CFM based on room volume.

How do I convert m³/h to L/s?

Divide m³/h by 3.6. For example, 36 m³/h ÷ 3.6 = 10 L/s. This works because 1 m³ = 1000 L and 1 hour = 3600 s, so the ratio is 1000/3600 = 1/3.6.

What flow rate does a typical showerhead use?

A standard showerhead in the US is limited to 2.5 GPM (9.46 L/min) by regulation. Water-efficient models use 1.5–2.0 GPM. A 10-minute shower at 2.5 GPM uses 25 gallons (94.6 L).