Convert flow rate between L/min, L/s, m³/h, GPM, CFM, bbl/day and 13 total units with instant all-units output and click-to-copy values.
Input
Enter a value and unit. All equivalents appear below. Click a card to copy.
Note on gallons: all gallon units below are US gallons (1 US gal = 3.785411784 L).
For UK / Imperial gallons (1 imp gal = 4.54609 L), multiply a US gallon result by 0.83267, or see the FAQ.
bbl = US petroleum barrel (42 US gal = 158.987 L), used for oil flow.
Presets
Results
Reference table
Value
L/min
L/s
m³/h
GPM (US)
CFM
1 L/min
1
0.01667
0.06
0.2642
0.03531
1 L/s
60
1
3.6
15.850
2.1189
1 m³/h
16.667
0.2778
1
4.4029
0.5886
1 m³/min
1000
16.667
60
264.17
35.315
1 GPM (US)
3.7854
0.06309
0.2271
1
0.1337
1 GPH (US)
0.06309
0.001052
0.003785
0.01667
0.002228
1 CFM
28.317
0.4719
1.6990
7.4805
1
1 CFS
1699.0
28.317
101.94
448.83
60
1 bbl/day (oil)
0.1104
0.001840
0.006624
0.02917
0.003899
100 L/min
100
1.6667
6
26.417
3.5315
FAQ
What does GPM mean — US or UK gallons?
GPM = gallons per minute. In the United States and in international plumbing, HVAC, and pump catalogs, GPM almost always refers to the US gallon (3.785411784 L). In the UK, Ireland, and some Commonwealth countries, older sources may use the Imperial gallon (4.54609 L), which is about 20 percent larger. 1 US GPM = 0.8327 Imperial GPM; 1 Imperial GPM = 1.2009 US GPM. This converter uses US gallons throughout. If you have Imperial gallons, multiply by 1.2009 before entering the value.
How do I convert flow rate to a volume over time?
Multiply the flow rate by the duration. For example, a tap running at 6 L/min for 10 minutes delivers 6 × 10 = 60 L. A pump at 15 m³/h for 8 hours moves 15 × 8 = 120 m³. Make sure both units use the same time base: if the pump is rated in GPM and you want liters over an hour, first convert to L/min, then multiply by 60.
What is the difference between CFM and m³/s?
CFM (cubic feet per minute) is a customary US unit common in ventilation and compressed air. m³/s is the SI unit used in engineering calculations. 1 CFM = 0.0004719 m³/s, and 1 m³/s = 2118.88 CFM. For HVAC you will more often see m³/h, where 1 CFM ≈ 1.699 m³/h.
L/min vs L/s — when is each used?
L/min (liters per minute) is convenient for household and low-rate flows: taps, showers, small pumps, garden hoses. L/s (liters per second) is used for larger flows such as fire hydrants, stormwater, and industrial cooling where per-minute numbers become awkward. 1 L/s = 60 L/min. A typical shower at 9 L/min equals 0.15 L/s; a fire hydrant at 30 L/s equals 1800 L/min.
What are typical flow rates in plumbing and HVAC?
Reference values: a kitchen tap delivers roughly 6 L/min (1.6 GPM); a low-flow shower 6–9 L/min; a bathtub fill 15–20 L/min; a garden hose 20–30 L/min; a residential well pump 20–40 L/min (5–10 GPM); a small circulation pump 1–3 m³/h; a modest HVAC fan 500–1500 CFM; a 1-ton chiller roughly 0.15 L/s of chilled water. These help sanity-check a conversion.
Why is bbl/day used for oil?
The oil and gas industry uses the US petroleum barrel (bbl) of 42 US gallons ≈ 158.987 L. Field production and pipeline throughput are reported in barrels per day (bbl/day, often abbreviated bpd or b/d). 1 bbl/day ≈ 0.1104 L/min ≈ 0.00662 m³/h. A well producing 1000 bbl/day corresponds to about 6.62 m³/h of liquid.
Results use standard SI conversion factors. Gallon units refer to US gallons; bbl is the US petroleum barrel (42 US gal).
The Flow Rate Converter transforms any volumetric flow rate into 13 common units at once: L/min (lpm), L/s, L/h, m³/s, m³/min, m³/h, mL/min, US gallons per minute (GPM), US gallons per hour (GPH), cubic feet per second (CFS), cubic feet per minute (CFM), cubic feet per hour, and oil barrels per day (bbl/day). Enter a value, pick the source unit, and the full grid updates instantly. Click any result card to copy its value to the clipboard. Presets cover common cases such as a tap at 6 L/min, a shower at 9 L/min, a garden hose at 25 L/min, 1 GPM, 1 m³/h, a 1000 CFM HVAC fan, a 100 GPM industrial pump, and a 1000 bbl/day oil well. Example: 10 L/min equals 0.1667 L/s, 0.6 m³/h, and 2.642 GPM. Gallon units refer to US gallons (3.785411784 L); the FAQ explains the Imperial (UK) gallon difference and covers GPM definitions, CFM vs m³/s, and typical plumbing and HVAC flow rates.