This page converts US gallons per day into US gallons per hour using the factor 0.04166665807, and shows the reverse figure alongside it. Both units measure volumetric flow, which is why one number does the whole job.
Used for fuel burn and small pumps. The rating unit for reverse-osmosis membranes and water demand.
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. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into US gallons per hour, which is usually more useful than the bare number.
The formula
US gallons per day- The amount you are converting, in US gallons per day
0.0416666580716- The exact number of US gallons per hour in one US gallon per day
US gallons per hour- The converted result
How it works, step by step
- Enter the value in US gallons per day.
- It is multiplied by 0.0416666580716, the exact factor between the two units.
- The answer is shown in US gallons per hour, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A bathroom tap: 2280 GPD in US gallons per hour
Take a bathroom tap, roughly 2280 GPD. The conversion is a single multiplication — 2280 × 0.0416667 — giving 95 GPH. Because the relationship is proportional, doubling the input doubles the answer to 190 GPH.
A fire hydrant: 1.37e+06 GPD in US gallons per hour
At 1.37e+06 GPD (a fire hydrant), the same quantity in US gallons per hour is 1.37e+06 × 0.0416667 = 57,083.3 GPH. One US gallon per day is 0.0416667 US gallons per hour, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many US gallons per hour are in one US gallon per day?
Exactly 0.0416666580716. 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 US gallons per hour?
US gallons per hour = US gallons per day × 0.0416666580716. Reversed, US gallons per day = US gallons per hour ÷ 0.0416666580716, which is the same as multiplying by 24.0000049507.
Which is the bigger unit, the US gallon per day or the US gallon per hour?
The US gallon per hour. One US gallon per day is only 0.0416667 of a US gallon per hour, so it takes 24 US gallons per day to make one US gallon 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 US gallon per hour?
Used for fuel burn and small pumps.
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 GPH in my head?
Plenty of people do this in their head: divide by 24 instead of using the exact factor 0.04166665807. At 100 that shortcut gives 4.1666667 US gallons per hour, off by 0.000001 US gallons per hour or about 0.00%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Day to US gallons per hour reference tables
| Us Gallons Per Day | Us Gallons Per Hour |
|---|---|
| 0.5 GPD | 0.0208333 GPH |
| 1 GPD | 0.0416667 GPH |
| 2 GPD | 0.0833333 GPH |
| 3 GPD | 0.125 GPH |
| 5 GPD | 0.208333 GPH |
| 10 GPD | 0.416667 GPH |
| 20 GPD | 0.833333 GPH |
| 25 GPD | 1.04167 GPH |
| 50 GPD | 2.08333 GPH |
| 75 GPD | 3.125 GPH |
| 100 GPD | 4.16667 GPH |
| 250 GPD | 10.4167 GPH |
| 500 GPD | 20.8333 GPH |
| 1000 GPD | 41.6667 GPH |
| 5000 GPD | 208.333 GPH |
Exact factor: 1 US gallon per day = 0.0416666580716 US gallons per hour.
| Quantity | GPD | GPH |
|---|---|---|
| A dripping tap | 2.282 GPD | 0.0951 GPH |
| A bathroom tap | 2282 GPD | 95.1 GPH |
| A shower head | 3652 GPD | 152.2 GPH |
| A garden hose | 6847 GPD | 285.3 GPH |
| A fire hydrant | 1.369e+06 GPD | 5.706e+04 GPH |
| The Thames at London | 1.484e+09 GPD | 6.182e+07 GPH |
Published reference values, converted with the same factor this page uses.