Flow Rate Converter
Enter a volumetric flow rate in any common unit and see it in all the others instantly: cubic metre per second (m³/s), cubic metre per hour (m³/h), litre per second (L/s), litre per minute (L/min), litre per hour (L/h), millilitre per minute (mL/min), cubic foot per second (ft³/s, the cusec), cubic foot per minute (ft³/min, CFM), US gallon per minute (GPM), US gallon per hour (GPH), imperial gallon per minute and oil barrel per day (bbl/day). The value is converted to m³/s internally and then to every unit using exact definitions, so conversions are precise. Handy for pumps and plumbing (GPM, L/min), HVAC and fans (CFM, m³/h), lab work (mL/min), irrigation (L/h) and oil and gas (bbl/day). Everything is computed locally in your browser.
m³/s
1.6667e-5
m³/h
0.06
L/s
0.01666667
L/min
1
L/h
60
mL/min
1,000
ft³/s (cusec)
0.00058858
ft³/min (CFM)
0.03531467
US gal/min (GPM)
0.26417205
US gal/h (GPH)
15.850323
imp gal/min
0.21996925
bbl/day
9.0573275
How to use
- Type a flow rate value.
- Pick the unit you entered it in.
- Read the value in every other unit and copy whichever you need.
Frequently asked questions
- How do I convert GPM to L/min?
- Multiply by 3.785411784, since a US liquid gallon is exactly 3.785411784 litres. So 5 GPM = 18.93 L/min, and going back, 1 L/min = 0.2642 GPM. A typical low-flow shower head is 2.5 GPM ≈ 9.46 L/min.
- What is CFM in m³/h?
- 1 ft³/min = 1.699011 m³/h (and 28.3168 L/min). Fan and ventilation ratings use CFM in the US and m³/h in most other countries, so a 400 CFM range hood is about 680 m³/h.
- Is a US gallon the same as an imperial gallon?
- No. A US liquid gallon is 3.785411784 L and an imperial (UK) gallon is 4.54609 L, so 1 imperial GPM = 1.2009 US GPM. Both are listed separately here — check which one a spec sheet means before converting.
- Does this work for air as well as water?
- Yes. Volumetric flow is volume per unit time regardless of the fluid, so the same conversions apply to air, water, oil or gas. Note that mass flow (kg/s) also depends on density, so it is a different quantity and is not converted here.
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