Gallon (US) per Hour to Liter per Hour (gal/h to LPH)
Convert gal/h to LPH — Flow Rate converter
One gallon (US) per hour equals 3.785412 LPH, so to convert gallons (US) per hour to liters per hour you multiply the value by 3.785412. A gallon (US) per hour is larger than a liter per hour — going the other way, 1 LPH = 0.26417205 gal/h. For example, 10 gal/h = 37.854118 LPH and 50 gal/h = 189.270589 LPH.
1 gal/h = 3.785412 LPH
Gallon (US) per Hour to Liter per Hour formula
1 Gallon (US) per Hour = 3.785412 LPH
Worked examples
- 25 gal/h = 94.635295 LPH
- 100 gal/h = 378.541178 LPH
Gallon (US) per Hour to Liter per Hour conversion table
| Gallon (US) per Hour (gal/h) | Liter per Hour (LPH) |
|---|---|
| 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 gal/h = 3.785412 LPH.
Frequently asked questions
How many liters per hour are in one gallon (US) per hour?
One gallon (US) per hour equals 3.785412 liters per hour (LPH).
How many gallons (US) per hour are in one liter per hour?
One liter per hour equals 0.26417205 gallons (US) per hour (gal/h).
How do you convert gallons (US) per hour to liters per hour?
1 Gallon (US) per Hour = 3.785412 LPH. Use the calculator above for any value.
What is 5 gal/h in LPH?
5 gal/h = 18.927059 LPH.
What is 100 gal/h in LPH?
100 gal/h = 378.541178 LPH.
What is 10 gal/h in LPH?
10 gal/h = 37.854118 LPH.
What is 20 gal/h in LPH?
20 gal/h = 75.708236 LPH.
What is 50 gal/h in LPH?
50 gal/h = 189.270589 LPH.
What is 500 gal/h in LPH?
500 gal/h = 1892.71 LPH.
Is a gallon (US) per hour bigger than a liter per hour?
Yes. A gallon (US) per hour is larger — one gallon (US) per hour equals 3.785412 liters per hour (LPH).