This page converts US gallons per day into barrels per day using the factor 0.0238095189, and shows the reverse figure alongside it. Both units measure volumetric flow, which is why one number does the whole job.
The unit oil production is reported in worldwide. 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. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in barrels per day, 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
0.0238095188994- The exact number of barrels per day in one US gallon per day
barrels per day- The converted result
How it works, step by step
- Enter the value in US gallons per day.
- It is multiplied by 0.0238095188994, the exact factor between the two units.
- The answer is shown in barrels per day, 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 barrels per day
Take a bathroom tap, roughly 2280 GPD. The conversion is a single multiplication — 2280 × 0.0238095 — giving 54.2857 bbl/d. Because the relationship is proportional, doubling the input doubles the answer to 108.571 bbl/d.
A dripping tap: 2.28 GPD in barrels per day
At 2.28 GPD (a dripping tap), the same quantity in barrels per day is 2.28 × 0.0238095 = 0.0542857 bbl/d. One US gallon per day is 0.0238095 barrels per day, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many barrels per day are in one US gallon per day?
Exactly 0.0238095188994. 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 barrels per day?
barrels per day = US gallons per day × 0.0238095188994. Reversed, US gallons per day = barrels per day ÷ 0.0238095188994, which is the same as multiplying by 42.0000086615.
Which is the bigger unit, the US gallon per day or the barrel per day?
The barrel per day. One US gallon per day is only 0.0238095 of a barrel per day, so it takes 42 US gallons per day to make one barrel 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 day?
The rating unit for reverse-osmosis membranes and water demand.
What is a barrel per day?
The unit oil production is reported in worldwide.
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 bbl/d in my head?
Plenty of people do this in their head: divide by 42 instead of using the exact factor 0.0238095189. At 100 that shortcut gives 2.3809524 barrels per day, off by 0.000000 barrels 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 Day to barrels per day reference tables
| Us Gallons Per Day | Barrels Per Day |
|---|---|
| 0.5 GPD | 0.0119048 bbl/d |
| 1 GPD | 0.0238095 bbl/d |
| 2 GPD | 0.047619 bbl/d |
| 3 GPD | 0.0714286 bbl/d |
| 5 GPD | 0.119048 bbl/d |
| 10 GPD | 0.238095 bbl/d |
| 20 GPD | 0.47619 bbl/d |
| 25 GPD | 0.595238 bbl/d |
| 50 GPD | 1.19048 bbl/d |
| 75 GPD | 1.78571 bbl/d |
| 100 GPD | 2.38095 bbl/d |
| 250 GPD | 5.95238 bbl/d |
| 500 GPD | 11.9048 bbl/d |
| 1000 GPD | 23.8095 bbl/d |
| 5000 GPD | 119.048 bbl/d |
Exact factor: 1 US gallon per day = 0.0238095188994 barrels per day.
| Quantity | GPD | bbl/d |
|---|---|---|
| A dripping tap | 2.282 GPD | 0.05434 bbl/d |
| A bathroom tap | 2282 GPD | 54.34 bbl/d |
| A shower head | 3652 GPD | 86.95 bbl/d |
| A garden hose | 6847 GPD | 163 bbl/d |
| A fire hydrant | 1.369e+06 GPD | 3.261e+04 bbl/d |
| The Thames at London | 1.484e+09 GPD | 3.532e+07 bbl/d |
Published reference values, converted with the same factor this page uses.