Flow rate
gph to L/h Converter
1 gph = 3.7854 L/h. Enter any value and the result updates instantly.
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Accuracy and rounding
Use volume-flow conversions only when the fluid volume per time is known; mass flow also depends on density.
Volume-flow units combine fixed volume definitions with fixed time units. U.S. gallons are used when gpm or gph is shown.
For pumps and HVAC, round L/h only after allowing for the equipment tolerance and operating point.
How to convert gph to L/h
- Type the gph value in the calculator.
- Keep gph selected as the from unit and L/h selected as the to unit.
- Use the instant result, or copy it with the copy button.
gph to L/h chart
| gph | L/h |
|---|---|
| 1 gph | 3.7854 L/h |
| 2 gph | 7.5708 L/h |
| 5 gph | 18.9271 L/h |
| 10 gph | 37.8541 L/h |
| 25 gph | 94.6353 L/h |
| 50 gph | 189.27 L/h |
| 100 gph | 378.54 L/h |
Formula
L/h = gph x 3.785411784
Example: 1 gph = 3.7854 L/h.
Source
Volume-per-time factors derived from NIST volume definitions and the SI second.
Common questions
How do I convert gph to L/h?
Enter the gph value in the converter, or multiply by the factor shown in the formula. 1 gph = 3.7854 L/h.
What should I watch out for?
GPM and GPH use U.S. liquid gallons; imperial gallons produce a different result.
Where does this flow rate conversion come from?
Volume-per-time factors derived from NIST volume definitions and the SI second. ConverterBase uses stable definitions and fixed conversion factors, not live or rounded market data.