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Convert flow rates between gallons per hour (GPH) and liters per hour (L/h) instantly with our free online calculator.
L/h = GPH × 3.78541
GPH = L/h ÷ 3.78541
| Gallons per Hour (GPH) | Liters per Hour (L/h) |
|---|---|
| 1 | 3.7854 |
| 5 | 18.9271 |
| 10 | 37.8541 |
| 25 | 94.6352 |
| 50 | 189.2705 |
| 100 | 378.5410 |
| 150 | 567.8115 |
| 200 | 757.0820 |
| 300 | 1135.6230 |
| 500 | 1892.7050 |
| 750 | 2839.0575 |
| 1000 | 3785.4100 |
| 2000 | 7570.8200 |
Gallons per hour (GPH) is an imperial unit of volumetric flow rate used primarily in the United States. It measures the volume of liquid that flows through a system in one hour. GPH is commonly used for applications with relatively low flow rates, such as fuel consumption in vehicles and aircraft, drip irrigation systems, chemical metering pumps, and small fountain pumps. For example, a typical car might consume 1-3 GPH at idle, while a commercial aircraft can burn 400-800 GPH during cruise flight. This unit provides an appropriate scale for measuring sustained, lower-volume fluid transfers.
Liters per hour (L/h) is the metric equivalent of GPH, measuring volumetric flow rate in the International System of Units. It represents the volume in liters that flows past a point in one hour. L/h is widely used internationally in medical applications (IV fluid delivery, dialysis), laboratory equipment, small pumps, and precision dosing systems. Medical IV drips typically deliver 50-150 L/h, while industrial chemical dosing pumps may deliver 1-100 L/h depending on the process requirements. This unit offers precision for applications where flow rates are too small to conveniently express in liters per minute.
Converting GPH to L/h is straightforward since both units use the same time period:
Example:
Convert 50 GPH to L/h:
50 × 3.78541 = 189.27 L/h
1 gallon per hour equals approximately 3.78541 liters per hour.
A typical passenger car at highway speeds consumes 1.5-3 GPH (5.7-11.4 L/h), while idling uses about 0.5-1 GPH (1.9-3.8 L/h). Large trucks can consume 8-15 GPH (30-57 L/h) under load.
Divide GPH by 60 to get gallons per minute (GPM). For example, 120 GPH ÷ 60 = 2 GPM.
Drip emitters typically deliver 0.5-2 GPH (1.9-7.6 L/h) per emitter. Calculate total GPH by multiplying emitters by their individual flow rate to size your system properly.
GPH is more appropriate for low-flow applications. It provides whole numbers instead of small decimals - for example, 2 GPH is easier to work with than 0.033 GPM.
Quality metering pumps can achieve ±1-2% accuracy when properly calibrated and maintained. Regular calibration checks are essential for precision applications like water treatment and pharmaceutical manufacturing.