Loading Calculator...
Please wait a moment
Please wait a moment
Convert flow rates between gallons per minute (GPM) and liters per minute (L/min) instantly with our free online calculator.
L/min = GPM × 3.78541
GPM = L/min ÷ 3.78541
| Gallons per Minute (GPM) | Liters per Minute (L/min) |
|---|---|
| 1 | 3.7854 |
| 2 | 7.5708 |
| 3 | 11.3562 |
| 5 | 18.9271 |
| 8 | 30.2833 |
| 10 | 37.8541 |
| 15 | 56.7812 |
| 20 | 75.7082 |
| 25 | 94.6352 |
| 30 | 113.5623 |
| 40 | 151.4164 |
| 50 | 189.2705 |
| 75 | 283.9058 |
| 100 | 378.5410 |
Gallons per minute (GPM) is the standard unit for measuring volumetric flow rate in the United States. It quantifies the volume of liquid flowing through a pipe, pump, or system in one minute. GPM is widely used in plumbing, fire protection, irrigation, and industrial applications. For example, typical residential water fixtures operate at 2-2.5 GPM, while fire hydrants can deliver 500-1,500 GPM. This measurement helps engineers and technicians properly size equipment, ensure adequate pressure, and calculate energy requirements for pumping systems.
Liters per minute (L/min) is the metric equivalent of GPM, measuring volumetric flow rate in the International System of Units. It represents the volume of fluid in liters passing a point each minute. L/min is the preferred unit in countries using the metric system and in scientific contexts worldwide. One liter equals 0.264 gallons, making the conversion straightforward. This unit is commonly used in medical oxygen delivery systems, aquarium pumps, automotive cooling systems, and laboratory equipment where precise flow measurement is critical.
Converting GPM to L/min requires a simple multiplication:
Example:
Convert 10 GPM to L/min:
10 × 3.78541 = 37.8541 L/min
1 gallon per minute equals approximately 3.78541 liters per minute.
A standard 5/8-inch garden hose with normal water pressure delivers approximately 5-10 GPM (19-38 L/min), while a 3/4-inch hose can deliver 10-15 GPM (38-57 L/min).
Many pump and equipment specifications use different units depending on the country of origin. Converting ensures proper equipment selection and system compatibility.
Fill a container of known volume (like a 5-gallon bucket) and time how long it takes to fill. Divide the volume by the time in minutes to get GPM.
Yes, higher pressure generally increases flow rate, while restrictions like small pipes, valves, and filters reduce flow rate even at high pressure.
For residential applications, whole-house filters should support 10-15 GPM (38-57 L/min) to accommodate multiple fixtures running simultaneously without pressure loss.