This converter turns oil barrels into imperial gallons instantly, using the exact factor 1 oil barrel = 34.97231575 imperial gallons. 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. Exactly 4.54609 litres, about 20% larger than the US gallon.
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
34.97231575- The exact number of imperial gallons in one oil barrel
imperial gallons- The converted result
How it works, step by step
- Enter the number of oil barrels you want to convert.
- The value is multiplied by 34.97231575, the exact conversion factor.
- The result is displayed in imperial gallons, 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 34.972316. That gives 174.8616 imperial gallons. A quick sanity check: one oil barrel is larger than one imperial gallon, so the number should get bigger — and it does.
Converting 72 oil barrels
72 × 34.972316 = 2,518.01 imperial gallons. Working backwards, 2,518.01 ÷ 34.972316 returns 72 oil barrels, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many imperial gallons are in one oil barrel?
Exactly 34.97231575. 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 imperial gallons?
Imperial Gallons = oil barrels × 34.97231575. To reverse it, divide instead: oil barrels = imperial gallons ÷ 34.97231575, which is the same as multiplying by 0.02859404585.
Is the oil barrel bigger than the imperial gallon?
Yes. One oil barrel equals 34.9723 imperial gallons, so it is the larger unit.
Why does my answer differ slightly from other oil-barrels to imperial-gallons 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 imperial gallon?
Exactly 4.54609 litres, about 20% larger than the US gallon.
Oil Barrels to imperial gallons reference table
| Oil Barrels | Imperial Gallons |
|---|---|
| 0.5 bbl | 17.4862 gal |
| 1 bbl | 34.9723 gal |
| 2 bbl | 69.9446 gal |
| 3 bbl | 104.9169 gal |
| 5 bbl | 174.8616 gal |
| 10 bbl | 349.7232 gal |
| 15 bbl | 524.5847 gal |
| 20 bbl | 699.4463 gal |
| 25 bbl | 874.3079 gal |
| 50 bbl | 1,748.62 gal |
| 75 bbl | 2,622.92 gal |
| 100 bbl | 3,497.23 gal |
| 250 bbl | 8,743.08 gal |
| 500 bbl | 17,486.16 gal |
| 1000 bbl | 34,972.32 gal |
Exact factor: 1 oil barrel = 34.97231575 imperial gallons. Values rounded for display.