This page converts US gallons per day into liters per hour using the factor 0.1577254585, and shows the reverse figure alongside it. Both units measure volumetric flow, which is why one number does the whole job.
The rating unit for reverse-osmosis membranes and water demand. The rating unit for dosing pumps, drip irrigation and small boilers.
Standard versus actual volume. Gas flow in CFM depends on pressure and temperature, which is why compressor ratings say SCFM and specify the reference conditions. Converting the number is exact; comparing two ratings measured at different conditions is not. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in liters per hour, so you can sanity-check whether your answer is a plausible size.
The formula
US gallons per day- The amount you are converting, in US gallons per day
0.157725458473- The exact number of liters per hour in one US gallon per day
liters per hour- The converted result
How it works, step by step
- Enter the value in US gallons per day.
- It is multiplied by 0.157725458473, the exact factor between the two units.
- The answer is shown in liters per hour, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A dripping tap: 2.28 GPD in liters per hour
Take a dripping tap, roughly 2.28 GPD. The conversion is a single multiplication — 2.28 × 0.157725 — giving 0.359614 L/h. Because the relationship is proportional, doubling the input doubles the answer to 0.719228 L/h.
A shower head: 3650 GPD in liters per hour
At 3650 GPD (a shower head), the same quantity in liters per hour is 3650 × 0.157725 = 575.698 L/h. One US gallon per day is 0.157725 liters per hour, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many liters per hour are in one US gallon per day?
Exactly 0.157725458473. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert US gallons per day to liters per hour?
liters per hour = US gallons per day × 0.157725458473. Reversed, US gallons per day = liters per hour ÷ 0.157725458473, which is the same as multiplying by 6.34013056409.
Which is the bigger unit, the US gallon per day or the liter per hour?
The liter per hour. One US gallon per day is only 0.157725 of a liter per hour, so it takes 6.34013 US gallons per day to make one liter per hour.
What does this quantity actually measure?
Both units measure volumetric flow. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a US gallon per day?
The rating unit for reverse-osmosis membranes and water demand.
What is a liter per hour?
The rating unit for dosing pumps, drip irrigation and small boilers.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do GPD to L/h in my head?
Plenty of people do this in their head: divide by 6.3 instead of using the exact factor 0.1577254585. At 100 that shortcut gives 15.873016 liters per hour, off by 0.1005 liters per hour or about 0.64%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Day to liters per hour reference tables
| Us Gallons Per Day | Liters Per Hour |
|---|---|
| 0.5 GPD | 0.0788627 L/h |
| 1 GPD | 0.157725 L/h |
| 2 GPD | 0.315451 L/h |
| 3 GPD | 0.473176 L/h |
| 5 GPD | 0.788627 L/h |
| 10 GPD | 1.57725 L/h |
| 20 GPD | 3.15451 L/h |
| 25 GPD | 3.94314 L/h |
| 50 GPD | 7.88627 L/h |
| 75 GPD | 11.8294 L/h |
| 100 GPD | 15.7725 L/h |
| 250 GPD | 39.4314 L/h |
| 500 GPD | 78.8627 L/h |
| 1000 GPD | 157.725 L/h |
| 5000 GPD | 788.627 L/h |
Exact factor: 1 US gallon per day = 0.157725458473 liters per hour.
| Quantity | GPD | L/h |
|---|---|---|
| A dripping tap | 2.282 GPD | 0.36 L/h |
| A bathroom tap | 2282 GPD | 360 L/h |
| A shower head | 3652 GPD | 576 L/h |
| A garden hose | 6847 GPD | 1080 L/h |
| A fire hydrant | 1.369e+06 GPD | 2.16e+05 L/h |
| The Thames at London | 1.484e+09 GPD | 2.34e+08 L/h |
Published reference values, converted with the same factor this page uses.