To convert barrels per day to cubic feet per second, multiply by 6.49836034e-05. 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.
The unit oil production is reported in worldwide. The cusec — how American river gauges and water rights report flow.
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 cubic feet per second, so you can sanity-check whether your answer is a plausible size.
The formula
barrels per day- The amount you are converting, in barrels per day
6.49836033951e-05- The exact number of cubic feet per second in one barrel per day
cubic feet per second- The converted result
How it works, step by step
- Enter the value in barrels per day.
- It is multiplied by 6.49836033951e-05, the exact factor between the two units.
- The answer is shown in cubic feet per second, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A dripping tap: 0.0543 bbl/d in cubic feet per second
A dripping tap comes to about 0.0543 bbl/d. Multiplying by the factor: 0.0543 × 6.49836e-05 = 3.52861e-06 cfs. Dividing the answer back by 6.49836e-05 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A shower head: 87 bbl/d in cubic feet per second
At 87 bbl/d (a shower head), the same quantity in cubic feet per second is 87 × 6.49836e-05 = 0.00565357 cfs. One barrel per day is 6.49836e-05 cubic feet per second, so the numbers shrink as expected.
How to read your score
Frequently asked questions
How many cubic feet per second are in one barrel per day?
Exactly 6.49836033951e-05. 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 barrels per day to cubic feet per second?
cubic feet per second = barrels per day × 6.49836033951e-05. Reversed, barrels per day = cubic feet per second ÷ 6.49836033951e-05, which is the same as multiplying by 15,388.4972171.
Which is the bigger unit, the barrel per day or the cubic foot per second?
The cubic foot per second. One barrel per day is only 6.49836e-05 of a cubic foot per second, so it takes 15,388.5 barrels per day to make one cubic foot per second.
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 barrel per day?
The unit oil production is reported in worldwide.
What is a cubic foot per second?
The cusec — how American river gauges and water rights report flow.
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 bbl/d to cfs in my head?
Plenty of people do this in their head: divide by 15,000 instead of using the exact factor 0.000065. At 100 that shortcut gives 0.0066666667 cubic feet per second, off by 0.0001683 cubic feet per second or about 2.59%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Barrels Per Day to cubic feet per second reference tables
| Barrels Per Day | Cubic Feet Per Second |
|---|---|
| 0.5 bbl/d | 3.24918e-05 cfs |
| 1 bbl/d | 6.49836e-05 cfs |
| 2 bbl/d | 0.000129967 cfs |
| 3 bbl/d | 0.000194951 cfs |
| 5 bbl/d | 0.000324918 cfs |
| 10 bbl/d | 0.000649836 cfs |
| 20 bbl/d | 0.00129967 cfs |
| 25 bbl/d | 0.00162459 cfs |
| 50 bbl/d | 0.00324918 cfs |
| 75 bbl/d | 0.00487377 cfs |
| 100 bbl/d | 0.00649836 cfs |
| 250 bbl/d | 0.0162459 cfs |
| 500 bbl/d | 0.0324918 cfs |
| 1000 bbl/d | 0.0649836 cfs |
| 5000 bbl/d | 0.324918 cfs |
Exact factor: 1 barrel per day = 6.49836033951e-05 cubic feet per second.
| Quantity | bbl/d | cfs |
|---|---|---|
| A dripping tap | 0.05434 bbl/d | 3.531e-06 cfs |
| A bathroom tap | 54.34 bbl/d | 0.003531 cfs |
| A shower head | 86.95 bbl/d | 0.00565 cfs |
| A garden hose | 163 bbl/d | 0.01059 cfs |
| A fire hydrant | 3.261e+04 bbl/d | 2.119 cfs |
| The Thames at London | 3.532e+07 bbl/d | 2295 cfs |
Published reference values, converted with the same factor this page uses.