This converter turns US gallons into oil barrels instantly, using the exact factor 1 US gallon = 0.02380952381 oil barrels. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk. The petroleum barrel: 42 US gallons, the global oil trading unit.
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
US gallons- The amount you are converting, measured in US gallons
0.02380952381- The exact number of oil barrels in one US gallon
oil barrels- The converted result
How it works, step by step
- Enter the number of US gallons you want to convert.
- The value is multiplied by 0.02380952381, the exact conversion factor.
- The result is displayed in oil barrels, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 US gallons
Multiply 5 by 0.023809524. That gives 0.119048 oil barrels. A quick sanity check: one US gallon is smaller than one oil barrel, so the number should get smaller — and it does.
Converting 72 US gallons
72 × 0.023809524 = 1.7143 oil barrels. Working backwards, 1.7143 ÷ 0.023809524 returns 72 US gallons, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many oil barrels are in one US gallon?
Exactly 0.02380952381. 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 US gallons to oil barrels?
Oil Barrels = US gallons × 0.02380952381. To reverse it, divide instead: US gallons = oil barrels ÷ 0.02380952381, which is the same as multiplying by 42.
Is the US gallon bigger than the oil barrel?
No. One US gallon is only 0.0238095 of a oil barrel, so the oil barrel is the larger unit.
Why does my answer differ slightly from other us-gallons to oil-barrels 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 US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
What is a oil barrel?
The petroleum barrel: 42 US gallons, the global oil trading unit.
Us Gallons to oil barrels reference table
| Us Gallons | Oil Barrels |
|---|---|
| 0.5 gal | 0.011905 bbl |
| 1 gal | 0.02381 bbl |
| 2 gal | 0.047619 bbl |
| 3 gal | 0.071429 bbl |
| 5 gal | 0.119048 bbl |
| 10 gal | 0.238095 bbl |
| 15 gal | 0.357143 bbl |
| 20 gal | 0.47619 bbl |
| 25 gal | 0.595238 bbl |
| 50 gal | 1.1905 bbl |
| 75 gal | 1.7857 bbl |
| 100 gal | 2.381 bbl |
| 250 gal | 5.9524 bbl |
| 500 gal | 11.9048 bbl |
| 1000 gal | 23.8095 bbl |
Exact factor: 1 US gallon = 0.02380952381 oil barrels. Values rounded for display.