Understanding Imperial Gallons to US Oil Barrels Conversion
The Imperial gallon is the UK liquid-volume standard of exactly 4.54609 litres. The US oil barrel is the petroleum-industry unit equal to 42 US liquid gallons, or about 158.987 litres. Converting Imperial gallons to oil barrels is common in energy trading and logistics, where fuel volumes measured in UK gallons must be expressed in the barrels used to price and ship crude oil.
Conversion Formula
To convert Imperial Gallons to US Oil Barrels, multiply by this factor:
Step-by-Step Example
Convert 25 Imperial Gallons to US Oil Barrels.
How to Convert Imperial Gallons to US Oil Barrels
Because a barrel is far larger than a gallon, this conversion shrinks your figure through one multiplication.
- Note the Imperial gallon volume: Record your value in imp-gal.
- Multiply by 0.02859405: Each Imperial gallon is 0.02859405 of a US oil barrel.
- Give the answer in bbl: The product is your volume in oil barrels.
- Worked result: For 25 imp-gal, calculate 25 × 0.02859405 = 0.714851 bbl.
Imperial Gallons to US Oil Barrels conversion table
| Imperial Gallons (imp-gal) | US Oil Barrels (bbl) |
|---|---|
| 0 | 0 |
| 1 | 0.02859405 |
| 2 | 0.05718809 |
| 3 | 0.08578214 |
| 4 | 0.1143762 |
| 5 | 0.1429702 |
| 6 | 0.1715643 |
| 7 | 0.2001583 |
| 8 | 0.2287524 |
| 9 | 0.2573464 |
| 10 | 0.2859405 |
| 15 | 0.4289107 |
| 20 | 0.5718809 |
| 25 | 0.7148511 |
| 30 | 0.8578214 |
| 40 | 1.143762 |
| 50 | 1.429702 |
| 60 | 1.715643 |
| 70 | 2.001583 |
| 80 | 2.287524 |
| 90 | 2.573464 |
| 100 | 2.859405 |
| 150 | 4.289107 |
| 200 | 5.718809 |
| 250 | 7.148511 |
| 300 | 8.578214 |
| 400 | 11.43762 |
| 500 | 14.29702 |
| 600 | 17.15643 |
| 700 | 20.01583 |
| 800 | 22.87524 |
| 900 | 25.73464 |
| 1000 | 28.59405 |
| 2000 | 57.18809 |
| 3000 | 85.78214 |
| 4000 | 114.3762 |
| 5000 | 142.9702 |
| 10000 | 285.9405 |
| 25000 | 714.8511 |
| 50000 | 1429.702 |
| 100000 | 2859.405 |
| 250000 | 7148.511 |
| 500000 | 14297.02 |
| 1000000 | 28594.05 |
Which gallon do you mean?
“gallon” means different units by region. This page uses the Imperial gallon (UK). 1 US Oil Barrels in each:
| Definition | Result |
|---|---|
| US gallon 3.785 L | 0.02380952 bbl |
| Imperial gallon (UK) 4.546 L | 0.02859405 bbl (this page) |
What is the Imperial Gallon?
The imperial gallon is a unit of volume used in the United Kingdom and several Commonwealth countries, most commonly for measuring fuel, beverages, and other liquids. It is noticeably larger than the US gallon.
Definition
The imperial gallon is defined as exactly 4.54609 litres:
This is an exact defining relation, not an approximation. The imperial gallon is also subdivided into 4 quarts, 8 pints, or 160 imperial fluid ounces, and it is about 20% larger than the US liquid gallon (3.78541 L).
Origin and History
The gallon descends from medieval English measures for wine and ale, which historically had several conflicting definitions. The imperial gallon was standardised by the British Weights and Measures Act of 1824, originally defined as the volume of 10 pounds of distilled water weighed in air at 62 °F. In 1985 the UK redefined it in exact metric terms as 4.54609 litres, aligning the traditional unit with the SI system.
Law and Notable Facts
The imperial gallon remains a legally recognised unit in the UK and countries such as Canada, though metric litres are now standard for most trade. A key point of confusion is that the imperial gallon (4.54609 L) differs from the US liquid gallon (3.785411784 L); the two share a name but are distinct units, so fuel-economy figures quoted in "miles per gallon" are not directly comparable between the UK and the US.
Real-World Examples and Conversions
- A UK fuel purchase of 10 imperial gallons is about 45.46 litres.
- A car rated at 50 miles per imperial gallon achieves roughly 41.6 miles per US gallon for the same efficiency.
- 1 imperial gallon of fresh water weighs about 4.546 kg (roughly 10 pounds), reflecting its original 1824 definition.
- 1 imperial gallon equals about 1.20095 US gallons.
What is the US Oil Barrel?
The US oil barrel (bbl) is a unit of volume equal to 42 US gallons, used almost exclusively for crude oil and petroleum products. It is the standard trading unit of the global oil industry.
Definition
The US oil barrel is defined as exactly 42 US liquid gallons:
Precisely, 1 bbl = 158.987294928 liters. This differs from other "barrel" definitions: the US fluid barrel is 31.5 gallons, the US federal beer barrel is 31 gallons, and the UK barrel is about 163.66 liters.
Origin and History
The 42-gallon standard traces to the early Pennsylvania oil boom of the 1860s. Producers adopted the 42-gallon "tierce" wooden barrel, which was slightly larger than the common 40-gallon whiskey barrel, allowing for spillage and evaporation losses during transport. In 1872 the Petroleum Producers Association formalized 42 gallons as the standard, and it endures today even though oil is now moved by pipeline and tanker rather than in physical barrels.
Law and Notable Facts
The oil barrel is not an SI unit but is deeply embedded in commodity markets, where crude prices are quoted per barrel and production in barrels per day (bbl/d). The abbreviation "bbl" is thought to stand for "blue barrels" once used by Standard Oil. Physical 42-gallon barrels are rarely used in the modern industry.
Real-World Examples and Conversions
- 1 bbl = 42 US gallons ≈ 34.97 imperial gallons ≈ 158.99 liters.
- Global crude oil consumption is roughly 100 million barrels per day.
- A single barrel of crude yields about 19 to 20 US gallons of gasoline after refining.
- 1 metric ton of crude oil is roughly 7.33 barrels, depending on density.
Frequently Asked Questions
How many US oil barrels are in an Imperial gallon?
One Imperial gallon equals about 0.0285941 US oil barrels, because a barrel holds 158.987 L against the gallon's 4.54609 L.
How large is a US oil barrel?
A US oil barrel is defined as 42 US liquid gallons, roughly 158.987 litres or about 34.97 Imperial gallons.
How do I convert oil barrels back to Imperial gallons?
Multiply the number of barrels by 34.97232 to return to Imperial gallons.
Why use barrels in the petroleum industry?
The 42-gallon barrel is the global convention for pricing, trading, and reporting crude oil and refined-product volumes.
What is 100 Imperial gallons in US oil barrels?
Multiply 100 by 0.02859405 to get 2.85941 US oil barrels.