Flow Rate Converter
Convert flow rates between gallons per minute (GPM), liters per minute, cubic meters per hour, cubic feet per minute (CFM), cubic feet per second and other volumetric flow units.
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Flow Rate units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the cubic meter per second (m³/s).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Cubic meter per second | m³/s | SI | Base unit |
| Cubic meter per hour | m³/h | SI-accepted | ≈ 0.0002777777778 m³/s |
| Cubic meter per minute | m³/min | SI-accepted | ≈ 0.01666666667 m³/s |
| Liter per second | L/s | SI-accepted | = 0.001 m³/s |
| Liter per minute | L/min | SI-accepted | ≈ 0.00001666666667 m³/s |
| Liter per hour | L/h | SI-accepted | ≈ 2.777777778e-7 m³/s |
| Milliliter per minute | mL/min | SI-accepted | ≈ 1.666666667e-8 m³/s |
| Cubic foot per second | ft³/s | US customary | = 0.028316846592 m³/s |
| Cubic foot per minute | CFM | US customary | = 0.0004719474432 m³/s |
| Gallon (US) per minute | GPM | US customary | = 0.0000630901964 m³/s |
| Gallon (US) per hour | GPH | US customary | ≈ 0.000001051503273 m³/s |
| Gallon (US) per day | GPD | US customary | ≈ 4.381263639e-8 m³/s |
| Million gallons (US) per day | MGD | US customary | ≈ 0.04381263639 m³/s |
| Gallon (imperial) per minute | imp gal/min | imperial | ≈ 0.00007576816667 m³/s |
| Barrel (oil) per day | bbl/d | US customary | ≈ 0.000001840130728 m³/s |
Cubic meter per second quick reference
| Cubic meter per second | Cubic meter per hour | Liter per second | Liter per minute |
|---|---|---|---|
| 1 m³/s | = 3600 m³/h | = 1000 L/s | = 60000 L/min |
| 10 m³/s | = 36000 m³/h | = 10000 L/s | = 600000 L/min |
| 100 m³/s | = 360000 m³/h | = 100000 L/s | = 6000000 L/min |
| 1000 m³/s | = 3600000 m³/h | = 1000000 L/s | = 60000000 L/min |
Among the 15 flow rate units on this page, the smallest is the milliliter per minute (mL/min) and the largest is the cubic meter per second (m³/s).
More flow rate conversions
- Gallon (US) per minute to Liter per minuteGPM → L/min
- Liter per minute to Gallon (US) per minuteL/min → GPM
- Cubic foot per minute to Cubic meter per hourCFM → m³/h
- Cubic meter per hour to Cubic foot per minutem³/h → CFM
- Cubic meter per hour to Gallon (US) per minutem³/h → GPM
- Gallon (US) per minute to Cubic meter per hourGPM → m³/h
- Liter per minute to Cubic meter per hourL/min → m³/h
- Liter per second to Gallon (US) per minuteL/s → GPM
- Cubic foot per second to Cubic meter per secondft³/s → m³/s
- Cubic meter per hour to Liter per minutem³/h → L/min
- Gallon (US) per minute to Liter per secondGPM → L/s
- Cubic meter per second to Cubic foot per secondm³/s → ft³/s
- Barrel (oil) per day to Cubic meter per hourbbl/d → m³/h
- Cubic meter per hour to Barrel (oil) per daym³/h → bbl/d
About flow rate units
Volumetric flow rate is the volume of fluid that passes a point per unit of time. Its SI unit is the cubic meter per second (m³/s). Water systems commonly use L/min, m³/h or GPM, air systems m³/h or CFM, and rivers m³/s or cfs.
One US gallon per minute is exactly 3.785411784 L/min, about 0.22712 m³/h. One CFM is about 1.6990 m³/h, and one cfs is about 28.317 L/s. US and imperial gallons differ: 1 imperial gallon per minute is about 1.2009 US GPM. An oil barrel is exactly 42 US gallons.
Frequently asked questions
- How do I convert GPM to L/min?
- Multiply by 3.785411784 (exact). For example, 10 GPM is about 37.85 L/min.
- How do I convert CFM to m³/h?
- Multiply by about 1.69901. For example, 100 CFM is about 169.9 m³/h.
- How many liters per day is one barrel per day?
- Exactly 158.987294928 liters per day, because an oil barrel is exactly 42 US gallons.
- How many cubic meters per hour are in one cubic meter per second?
- One cubic meter per second = 3600 m³/h (cubic meters per hour).
- How many liters per second are in one cubic meter per second?
- One cubic meter per second = 1000 L/s (liters per second).
- How many liters per minute are in one cubic meter per second?
- One cubic meter per second = 60000 L/min (liters per minute).