This converter turns imperial gallons into oil barrels instantly, using the exact factor 1 imperial gallon = 0.02859404585 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 4.54609 litres, about 20% larger than the US gallon. 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
imperial gallons- The amount you are converting, measured in imperial gallons
0.02859404585- The exact number of oil barrels in one imperial gallon
oil barrels- The converted result
How it works, step by step
- Enter the number of imperial gallons you want to convert.
- The value is multiplied by 0.02859404585, 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 imperial gallons
Multiply 5 by 0.028594046. That gives 0.14297 oil barrels. A quick sanity check: one imperial gallon is smaller than one oil barrel, so the number should get smaller — and it does.
Converting 72 imperial gallons
72 × 0.028594046 = 2.0588 oil barrels. Working backwards, 2.0588 ÷ 0.028594046 returns 72 imperial 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 imperial gallon?
Exactly 0.02859404585. 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 imperial gallons to oil barrels?
Oil Barrels = imperial gallons × 0.02859404585. To reverse it, divide instead: imperial gallons = oil barrels ÷ 0.02859404585, which is the same as multiplying by 34.97231575.
Is the imperial gallon bigger than the oil barrel?
No. One imperial gallon is only 0.028594 of a oil barrel, so the oil barrel is the larger unit.
Why does my answer differ slightly from other imperial-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 imperial gallon?
Exactly 4.54609 litres, about 20% larger than the US gallon.
What is a oil barrel?
The petroleum barrel: 42 US gallons, the global oil trading unit.
Imperial Gallons to oil barrels reference table
| Imperial Gallons | Oil Barrels |
|---|---|
| 0.5 gal | 0.014297 bbl |
| 1 gal | 0.028594 bbl |
| 2 gal | 0.057188 bbl |
| 3 gal | 0.085782 bbl |
| 5 gal | 0.14297 bbl |
| 10 gal | 0.28594 bbl |
| 15 gal | 0.428911 bbl |
| 20 gal | 0.571881 bbl |
| 25 gal | 0.714851 bbl |
| 50 gal | 1.4297 bbl |
| 75 gal | 2.1446 bbl |
| 100 gal | 2.8594 bbl |
| 250 gal | 7.1485 bbl |
| 500 gal | 14.297 bbl |
| 1000 gal | 28.594 bbl |
Exact factor: 1 imperial gallon = 0.02859404585 oil barrels. Values rounded for display.