L/min to GPM Volumetric Flow Rate Conversion Chart
| Liter per minute (L/min) | Gallon per minute (US) (gpm) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 1 L/min | 0.26 gpm | Laboratory Microfluidic Peristaltic Dispensing Tube | 1 × 0.264172 = 0.264 GPM |
| 2 L/min | 0.53 gpm | Medical Oxygen Concentrator Humidifier Water Supply | 2 × 0.264172 = 0.528 GPM |
| 5 L/min | 1.32 gpm | European Eco-Standard Bathroom Sink Basin Mixer | 5 × 0.264172 = 1.32 GPM |
| 10 L/min | 2.64 gpm | European Residential Shower Mixer Valve Normal Discharge | 10 × 0.264172 = 2.64 GPM |
| 15 L/min | 3.96 gpm | Commercial Espresso Machine Water Boiler Feed Pump | 15 × 0.264172 = 3.96 GPM |
| 20 L/min | 5.28 gpm | Residential Domestic Water Softener Regeneration Flow | 20 × 0.264172 = 5.28 GPM |
| 25 L/min | 6.6 gpm | Compact Hydronic Underfloor Heating Manifold Loop | 25 × 0.264172 = 6.6 GPM |
| 40 L/min | 10.57 gpm | Residential Gas Combination Boiler Domestic Hot Water Circuit | 40 × 0.264172 = 10.57 GPM |
| 50 L/min | 13.21 gpm | Commercial Kitchen Automatic Glasswasher Wash Pump | 50 × 0.264172 = 13.21 GPM |
| 75 L/min | 19.81 gpm | Solar Thermal Collector Hydronic Loop Transfer Pump | 75 × 0.264172 = 19.81 GPM |
| 100 L/min | 26.42 gpm | Light Industrial Cooling Tower Chemical Dosing Circuit | 100 × 0.264172 = 26.42 GPM |
| 200 L/min | 52.83 gpm | Commercial Hydronic Heating Primary Loop Circulation Pump | 200 × 0.264172 = 52.83 GPM |
| 500 L/min | 132.09 gpm | Industrial Food Processing Liquid Blending Line Feed | 500 × 0.264172 = 132.09 GPM |
| 1000 L/min | 264.17 gpm | Municipal Secondary Clarifier Effluent Discharge Header | 1000 × 0.264172 = 264.17 GPM |
| 2000 L/min | 528.34 gpm | Industrial Plant Stormwater Interceptor Lift Pump | 2000 × 0.264172 = 528.34 GPM |
Liter per minute to Gallon per minute (US) Formula & Unit Definitions
One US liquid gallon contains exactly 3.785411784 liters. Inverting this relationship (1 ÷ 3.785411784) yields approximately 0.264172052 (~0.264172). Because both units measure volume over an identical one-minute duration, multiplying any metric flow rate in liters per minute by 0.264172 provides the exact discharge in US gallons per minute.
Quick Estimation: Quick mental shortcut: To convert L/min to GPM in your head, divide the L/min by 4 and add roughly 5%. For example, 20 L/min ÷ 4 = 5; add 5% gives 5.25 GPM (exact: 5.28 GPM); 40 L/min ÷ 4 = 10; add 5% gives 10.5 GPM (exact: 10.57 GPM).
Liter per minute — L/min
SI Metric Standard- Standard metric unit for volumetric flow rate (1 L/min = 1 cubic decimeter per minute)
- Universal benchmark for European plumbing fixtures, medical oxygenators, and metric dosing pumps
- Equivalent to approximately 0.264172 US gallons per minute (and 0.06 cubic meters per hour)
Gallon per minute — GPM
US Customary Flow- Standard US engineering unit for liquid flow rate (1 GPM = 231 cubic inches per minute)
- Dominant specification across North American domestic plumbing, boiler systems, and fire sprinklers
- Equivalent to exactly 3.785412 liters per minute (based on the US liquid gallon)
Frequently Asked Questions
Q.How do you convert liters per minute to GPM accurately?
Multiply the flow rate in liters per minute by 0.264172 (or divide by 3.785412). For example, 10 L/min × 0.264172 = 2.64 GPM.
Q.What is the reverse conversion from GPM to liters per minute?
To convert back, use the GPM to Liters per Minute Converter where 1 GPM equals exactly 3.785412 L/min.
Q.Does this calculation convert to US gallons or Imperial UK gallons?
This tool converts to US liquid gallons (1 US gal = 3.785412 L). For Imperial UK gallons (1 UK gal = 4.54609 L), multiply L/min by 0.219969 instead.
Q.What is 20 liters per minute in US gallons per minute?
20 liters per minute equals approximately 5.28 GPM, a typical domestic main water service flow rate.