Flow Converter
Convert between volumetric flow rate units — cubic meters per second, liters per minute, US and UK gallons per minute, cubic feet per minute (CFM), oil barrels per day, and more.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
100 L/min = 26.417257 gal(US)/min
1 Liter per Minute = 0.26417257 Gallons (US) per Minute
1 Gallon (US) per Minute = 3.7854044 Liters per Minute
100 L/min in every supported unit
What is a Flow Converter?
Flow rate — more precisely volumetric flow rate — is the volume of a fluid (liquid or gas) that passes a given point in a pipe, channel, or duct per unit of time. It's the number behind "how many gallons a minute is this shower head using," "how much air is this duct moving," or "how many barrels of oil is this well producing per day." Because the same physical flow can be described in dozens of unit systems — metric cubic meters, everyday liters, US or UK gallons, cubic feet, or petroleum barrels — a converter that ties them all to a common base is essential for comparing figures across industries and countries.
This tool is used across plumbing (fixture and pump ratings), HVAC (duct airflow and fan sizing, usually in CFM), industrial process piping, agricultural and garden irrigation, engine fuel delivery, and river or reservoir water management (discharge measured in cubic feet or cubic meters per second). Every unit below is defined relative to the SI base unit, cubic meter per second, so any two flow units can be converted directly and consistently.
Conversion chart: Liter per Minute to Gallons (US) per Minute
Conversion table
| Liter per Minute (L/min) | Gallon (US) per Minute (gal(US)/min) |
|---|---|
| 0.01 L/min | 0.0026417257 gal(US)/min |
| 0.1 L/min | 0.026417257 gal(US)/min |
| 1 L/min | 0.26417257 gal(US)/min |
| 2 L/min | 0.52834513 gal(US)/min |
| 3 L/min | 0.7925177 gal(US)/min |
| 5 L/min | 1.3208628 gal(US)/min |
| 10 L/min | 2.6417257 gal(US)/min |
| 20 L/min | 5.2834513 gal(US)/min |
| 50 L/min | 13.208628 gal(US)/min |
| 100 L/min | 26.417257 gal(US)/min |
| 1000 L/min | 264.17257 gal(US)/min |
Supported Units
| Unit | Symbol | In m³/s |
|---|---|---|
| Cubic Meter per Second | m³/s | 1 m³/s |
| Cubic Meter per Minute | m³/min | 0.016666667 m³/s |
| Cubic Meter per Hour | m³/h | 0.0002777778 m³/s |
| Cubic Meter per Day | m³/d | 1.15741E-05 m³/s |
| Liter per Second | L/s | 0.001 m³/s |
| Liter per Minute | L/min | 1.66667E-05 m³/s |
| Liter per Hour | L/h | 2.77778E-07 m³/s |
| Liter per Day | L/d | 1.15741E-08 m³/s |
| Milliliter per Second | mL/s | 1E-06 m³/s |
| Gallon (US) per Second | gal(US)/s | 0.0037854118 m³/s |
| Gallon (US) per Minute | gal(US)/min | 6.30902E-05 m³/s |
| Gallon (US) per Hour | gal(US)/h | 1.0515E-06 m³/s |
| Gallon (US) per Day | gal(US)/d | 4.38126E-08 m³/s |
| Gallon (UK) per Minute | gal(UK)/min | 7.57682E-05 m³/s |
| Gallon (UK) per Hour | gal(UK)/h | 1.2628E-06 m³/s |
| Barrel (US) per Day | bbl(US)/d | 1.84013E-06 m³/s |
| Barrel (US) per Hour | bbl(US)/h | 4.41631E-05 m³/s |
| Cubic Foot per Second | ft³/s | 0.028316847 m³/s |
| Cubic Foot per Minute | ft³/min | 0.0004719474 m³/s |
| Cubic Foot per Hour | ft³/h | 7.86579E-06 m³/s |
| Cubic Inch per Second | in³/s | 1.63871E-05 m³/s |
| Cubic Yard per Second | yd³/s | 0.76455486 m³/s |
About These Parameters
- Value
- The flow rate value you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in — a pump datasheet's L/min, a duct fan's CFM, or a well's GPM.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Flow Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to cubic meters per second. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Liter per Minute → Gallon (US) per Minute: multiply by 0.26417257. For example, 100 L/min × 0.26417257 = 26.417257 gal(US)/min.
Volumetric Flow vs. Mass Flow
Every unit on this page measures volumetric flow — the VOLUME of fluid moving past a point per unit time, regardless of what that fluid weighs. That's the right measure for most liquids, since a liter of water always occupies the same space. For compressible gases, however, the same volume can represent very different masses depending on temperature and pressure, which is why processes like natural gas metering or compressed-air sizing often need MASS flow instead — the site's separate Flow - Mass Converter covers units like kilograms per second for exactly that case.
US vs. Imperial Gallons
A US gallon and a UK (imperial) gallon are not the same size — the imperial gallon is about 20% larger (roughly 4.546 liters versus the US gallon's 3.785 liters). That means "gallons per minute" means two different physical flow rates depending on which gallon is meant, and mixing them up is a common real-world error when comparing British and American pump, hose, or fixture specifications. Always check whether a gal/min figure is US or UK before treating it as equivalent — this converter keeps them as clearly separate units for exactly that reason.
Example
A flow rate of 100 L/min equals 26.417257 gal(US)/min. For scale, a typical residential shower head flows around 2 US gallons per minute (roughly 7.6 L/min), a home HVAC return duct might move 400-800 CFM of air, and a moderate river might discharge several hundred cubic feet per second.
Frequently Asked Questions
What's the difference between GPM and CFM?
GPM (gallons per minute) measures liquid flow, most often water, while CFM (cubic feet per minute) measures gas or air flow, most often in HVAC ductwork and compressed-air systems. They're both volumetric flow units, just conventionally applied to different kinds of fluid and scaled to different everyday magnitudes.
How do I convert between US and UK gallons per minute?
Select "Gallon (US) per Minute" or "Gallon (UK) per Minute" as your From or To unit in the converter above — the two are kept as distinct units because the imperial gallon is about 20% larger than the US gallon, so the same physical flow rate produces a different number in each system.
How accurate are these conversions?
Every conversion factor used here is the exact, internationally recognized relationship between the underlying volume and time units — results are limited only by floating-point display precision, not by rounded conversion constants.
Why is oil production measured in barrels per day?
The 42-US-gallon petroleum barrel became the oil industry's standard unit in the early 20th century, and "barrels per day" (bbl/d) stuck as the universal way to report well production, refinery throughput, and pipeline capacity — even in countries that otherwise use metric units for everything else.