Gallon (US) per Minute to Liter per Minute (GPM to LPM)
Convert GPM to LPM — Flow Rate converter
One gallon (US) per minute equals 3.785412 LPM, so to convert gallons (US) per minute to liters per minute you multiply the value by 3.785412. A gallon (US) per minute is larger than a liter per minute — going the other way, 1 LPM = 0.26417205 GPM. For example, 10 GPM = 37.854118 LPM and 50 GPM = 189.270589 LPM.
1 GPM = 3.785412 LPM
Gallon (US) per Minute to Liter per Minute formula
1 Gallon (US) per Minute = 3.785412 LPM
Worked examples
- 25 GPM = 94.635295 LPM
- 100 GPM = 378.541178 LPM
Gallon (US) per Minute to Liter per Minute conversion table
| Gallon (US) per Minute (GPM) | Liter per Minute (LPM) |
|---|---|
| 1 | 3.785412 |
| 2 | 7.570824 |
| 3 | 11.356235 |
| 5 | 18.927059 |
| 8 | 30.283294 |
| 10 | 37.854118 |
| 12 | 45.424941 |
| 15 | 56.781177 |
| 20 | 75.708236 |
| 25 | 94.635295 |
| 50 | 189.270589 |
| 100 | 378.541178 |
| 250 | 946.352946 |
| 500 | 1892.71 |
| 1000 | 3785.41 |
Which gallon, and which trade
The single most expensive mistake in flow conversion is the gallon. A US liquid gallon is 3.785411784 litres; an imperial gallon is 4.54609 litres. US GPM and imperial GPM differ by about 20%, and pump datasheets frequently do not say which one they mean. Check the manufacturer's country of origin before trusting a GPM figure.
Different trades default to different units for the same physical quantity: HVAC and compressed air work in CFM, plumbing and pumps in GPM or LPM, and process and water engineering in m³/h or L/s. A specification that mixes them is usually quoting different equipment, not different flows. On this page, 1 GPM = 3.785412 LPM.
For quick mental work, GPM × 3.8 gets you within half a percent of LPM, and LPM ÷ 4 is a usable field approximation in the other direction.
Frequently asked questions
How many liters per minute are in one gallon (US) per minute?
One gallon (US) per minute equals 3.785412 liters per minute (LPM).
How many gallons (US) per minute are in one liter per minute?
One liter per minute equals 0.26417205 gallons (US) per minute (GPM).
How do you convert gallons (US) per minute to liters per minute?
1 Gallon (US) per Minute = 3.785412 LPM. Use the calculator above for any value.
What is 5 GPM in LPM?
5 GPM = 18.927059 LPM.
What is 100 GPM in LPM?
100 GPM = 378.541178 LPM.
What is 10 GPM in LPM?
10 GPM = 37.854118 LPM.
What is 20 GPM in LPM?
20 GPM = 75.708236 LPM.
What is 50 GPM in LPM?
50 GPM = 189.270589 LPM.
What is 500 GPM in LPM?
500 GPM = 1892.71 LPM.
Is a gallon (US) per minute bigger than a liter per minute?
Yes. A gallon (US) per minute is larger — one gallon (US) per minute equals 3.785412 liters per minute (LPM).