To convert US gallons per hour to US gallons per day, multiply by 24.00000495. That factor is the whole relationship: both units measure volumetric flow, so the conversion is a proportion with no offset and no substance-specific constant.
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 day, which is usually more useful than the bare number.
The formula
US gallons per hour- The amount you are converting, in US gallons per hour
24.0000049507- The exact number of US gallons per day in one US gallon per hour
US gallons per day- The converted result
How it works, step by step
- Enter the value in US gallons per hour.
- It is multiplied by 24.0000049507, the exact factor between the two units.
- The answer is shown in US gallons per day, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A garden hose: 285 GPH in US gallons per day
At 285 GPH (a garden hose), the same quantity in US gallons per day is 285 × 24 = 6840 GPD. One US gallon per hour is 24 US gallons per day, so the numbers grow as expected.
A shower head: 152 GPH in US gallons per day
A shower head comes to about 152 GPH. Multiplying by the factor: 152 × 24 = 3648 GPD. Dividing the answer back by 24 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
How to read your score
Frequently asked questions
How many US gallons per day are in one US gallon per hour?
Exactly 24.0000049507. 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 hour to US gallons per day?
US gallons per day = US gallons per hour × 24.0000049507. Reversed, US gallons per hour = US gallons per day ÷ 24.0000049507, which is the same as multiplying by 0.0416666580716.
Which is the bigger unit, the US gallon per hour or the US gallon per day?
The US gallon per hour. One US gallon per hour equals 24 US gallons per day.
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 hour?
Used for fuel burn and small pumps.
What is a US gallon per day?
The rating unit for reverse-osmosis membranes and water demand.
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 GPH to GPD in my head?
Plenty of people do this in their head: multiply by 24 instead of using the exact factor 24.00000495. At 100 that shortcut gives 2400 US gallons per day, off by 0.0004951 US gallons per day or about 0.00%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Us Gallons Per Hour to US gallons per day reference tables
| Us Gallons Per Hour | Us Gallons Per Day |
|---|---|
| 0.5 GPH | 12 GPD |
| 1 GPH | 24 GPD |
| 2 GPH | 48 GPD |
| 3 GPH | 72 GPD |
| 5 GPH | 120 GPD |
| 10 GPH | 240 GPD |
| 20 GPH | 480 GPD |
| 25 GPH | 600 GPD |
| 50 GPH | 1200 GPD |
| 75 GPH | 1800 GPD |
| 100 GPH | 2400 GPD |
| 250 GPH | 6000 GPD |
| 500 GPH | 12,000 GPD |
| 1000 GPH | 24,000 GPD |
| 5000 GPH | 120,000 GPD |
Exact factor: 1 US gallon per hour = 24.0000049507 US gallons per day.
| Quantity | GPH | GPD |
|---|---|---|
| A dripping tap | 0.0951 GPH | 2.282 GPD |
| A bathroom tap | 95.1 GPH | 2282 GPD |
| A shower head | 152.2 GPH | 3652 GPD |
| A garden hose | 285.3 GPH | 6847 GPD |
| A fire hydrant | 5.706e+04 GPH | 1.369e+06 GPD |
| The Thames at London | 6.182e+07 GPH | 1.484e+09 GPD |
Published reference values, converted with the same factor this page uses.