Convert Imperial Gallon to US Oil Barrel
Convert imperial gallons to us oil barrels instantly. 1 imperial gallon = 0.0285940458 us oil barrel — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Oil Barrel to Imperial Gallon converter for the reverse conversion.
Units explained
Imperial Gallon
The imperial gallon is defined as exactly 4.54609 liters.
Set by the British Weights and Measures Act of 1824 as the volume of 10 lb of water.
Used for fuel and beverages in the UK and Commonwealth.
UK, 1824.
US Oil Barrel
The petroleum barrel is exactly 42 US gallons (158.987 L).
Set by the US petroleum industry in the 1860s and now a global oil-trade standard.
The standard unit for crude-oil pricing and production worldwide.
US oil industry, 1860s.
Imperial Gallon to US Oil Barrel conversion formula
The relationship between imperial gallons and us oil barrels:
To convert imperial gallons to us oil barrels, multiply the value in imperial gallons by 0.0285940458. To reverse, multiply us oil barrels by 34.9723157544.
How to use this converter
Type a value into the calculator. The result in us oil barrels updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Oil Barrel to Imperial Gallon converter for the reverse direction.
Step-by-step: convert imperial gallons to us oil barrels
- Write down the value in imperial gallons (gal).
- Multiply that value by the factor 0.0285940458.
- The product is the equivalent value in us oil barrels (bbl (oil)).
- To reverse, multiply the us oil barrel value by 34.9723157544.
Worked examples
Example 1 — Convert 1 gal to bbl (oil):
1 × 0.0285940458 = 0.0285940458 bbl (oil)
Example 2 — Convert 100 gal to bbl (oil):
100 × 0.0285940458 = 2.8594045845 bbl (oil)
Real-world example — Body height conversion
You enter your height as 180 imperial gallons into an international job or visa application. The form then asks for the same value in us oil barrels — converting between these adjacent units is one of the most-used length conversions globally.
180 gal × 0.0285940458 = 5.1469282522 bbl (oil)
Real-world example — Furniture and large objects
A 72-imperial gallon piece of furniture converts to a value in us oil barrels that's easier to mentally compare with room dimensions. This is the typical workflow when shopping internationally and product specs use a different unit than your room measurements.
72 gal × 0.0285940458 = 2.0587713009 bbl (oil)
Real-world example — Children's height milestones
A 150-imperial gallon-tall child measures a value in us oil barrels that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 gal × 0.0285940458 = 4.2891068768 bbl (oil)
Imperial Gallon to US Oil Barrel conversion table
Standard reference values for converting imperial gallons to us oil barrels:
| Imperial Gallon [gal] | US Oil Barrel [bbl (oil)] |
|---|---|
| 0.01 | 0.0002859405 |
| 0.1 | 0.0028594046 |
| 1 | 0.0285940458 |
| 2 | 0.0571880917 |
| 3 | 0.0857821375 |
| 4 | 0.1143761834 |
| 5 | 0.1429702292 |
| 10 | 0.2859404585 |
| 20 | 0.5718809169 |
| 30 | 0.8578213754 |
| 40 | 1.1437618338 |
| 50 | 1.4297022923 |
| 100 | 2.8594045845 |
| 500 | 14.2970229227 |
| 1000 | 28.5940458454 |
Frequently asked questions
How many us oil barrels is 1 imperial gallon?
How do I convert imperial gallons to us oil barrels?
How do I convert us oil barrels back to imperial gallons?
How many us oil barrels is 100 imperial gallons?
Popular volume unit conversions
Convert Imperial Gallon to other volume units
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Metric / SI (15 units)
US Customary (Liquid) (15 units)
US Customary (Dry) (5 units)
Imperial (UK) (13 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 0.0285940458 bbl (oil)) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.