What this converter does
This converter turns volumetric flow between litres per minute, US gallons per minute, litres per second, cubic metres per hour and cubic feet per minute — instantly and with exact factors. Type a value, pick the units, and the answer updates as you type.
One litre per minute equals about 0.264 US gallons per minute. These figures use the US gallon; the UK gallon is larger. For pumps, pipes and irrigation, LPM ↔ GPM is the everyday pair.
The units it covers
Every unit measures volumetric flow, so each converts through the cubic metre per second with a fixed ratio.
View all units & their values
| Unit | Symbol | Value | Mainly used |
|---|---|---|---|
| Litre per minute | LPM | 1.667e-5 | Metric pumps, taps, filters |
| US gallon per minute | GPM | 6.309e-5 | US pumps, plumbing, irrigation |
| Litre per second | LPS | 0.001 | Larger metric flows |
| Cubic metre per hour | m³/h | 2.778e-4 | HVAC, water supply, process |
| Cubic foot per minute | CFM | 4.719e-4 | Air and gas flow |
The formula
Each unit has a fixed value in m³/s, so any conversion goes through it once:
result = value × factor_from ÷ factor_toWhere:
- value = the number you typed, in the “from” unit
- factor_from = the “from” unit’s value in m³/s
- factor_to = the “to” unit’s value in m³/s
Worked example
Convert 40 LPM to US gallons per minute.
1 LPM ≈ 0.264172 US GPM40 × 0.264172 = 10.567 GPMSo 40 litres per minute is about 10.6 US GPM.
The units in this example
A metric flow-rate unit — litres per minute. Common on taps, filters and small metric pumps.
- 1 LPM ≈ 0.2642 GPM
- 1 LPM = 1/60 LPS
- 1 LPM = 0.06 m³/h
- 1 LPM ≈ 0.0353 CFM
A US flow-rate unit — US gallons per minute. Standard for pumps, plumbing and irrigation in the United States.
- 1 GPM ≈ 3.7854 LPM
- 1 GPM ≈ 0.06309 LPS
- 1 GPM ≈ 0.2271 m³/h
- 3.7854 LPM = 1 GPM