This converter turns oil barrels into cubic feet instantly, using the exact factor 1 oil barrel = 5.614583333 cubic feet. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The petroleum barrel: 42 US gallons, the global oil trading unit. The volume of a one-foot cube — used for shipping, refrigerators and natural gas.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
oil barrels- The amount you are converting, measured in oil barrels
5.614583333- The exact number of cubic feet in one oil barrel
cubic feet- The converted result
How it works, step by step
- Enter the number of oil barrels you want to convert.
- The value is multiplied by 5.614583333, the exact conversion factor.
- The result is displayed in cubic feet, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 oil barrels
Multiply 5 by 5.6145833. That gives 28.0729 cubic feet. A quick sanity check: one oil barrel is larger than one cubic foot, so the number should get bigger — and it does.
Converting 72 oil barrels
72 × 5.6145833 = 404.25 cubic feet. Working backwards, 404.25 ÷ 5.6145833 returns 72 oil barrels, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many cubic feet are in one oil barrel?
Exactly 5.614583333. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert oil barrels to cubic feet?
Cubic Feet = oil barrels × 5.614583333. To reverse it, divide instead: oil barrels = cubic feet ÷ 5.614583333, which is the same as multiplying by 0.1781076067.
Is the oil barrel bigger than the cubic foot?
Yes. One oil barrel equals 5.61458 cubic feet, so it is the larger unit.
Why does my answer differ slightly from other oil-barrels to cubic-feet converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a oil barrel?
The petroleum barrel: 42 US gallons, the global oil trading unit.
What is a cubic foot?
The volume of a one-foot cube — used for shipping, refrigerators and natural gas.
Oil Barrels to cubic feet reference table
| Oil Barrels | Cubic Feet |
|---|---|
| 0.5 bbl | 2.8073 ft³ |
| 1 bbl | 5.6146 ft³ |
| 2 bbl | 11.2292 ft³ |
| 3 bbl | 16.8438 ft³ |
| 5 bbl | 28.0729 ft³ |
| 10 bbl | 56.1458 ft³ |
| 15 bbl | 84.2188 ft³ |
| 20 bbl | 112.2917 ft³ |
| 25 bbl | 140.3646 ft³ |
| 50 bbl | 280.7292 ft³ |
| 75 bbl | 421.0938 ft³ |
| 100 bbl | 561.4583 ft³ |
| 250 bbl | 1,403.65 ft³ |
| 500 bbl | 2,807.29 ft³ |
| 1000 bbl | 5,614.58 ft³ |
Exact factor: 1 oil barrel = 5.614583333 cubic feet. Values rounded for display.