An imperial fluid ounce is 1/160 of an imperial gallon.
Imperial fluid ounces to Oil barrels Converter — imp fl oz to bbl
Convert Imperial fluid ounce (imp fl oz) to Oil barrel (bbl) using the exact conversion factor (1 imperial fluid ounce = 0.0001787128 oil barrel). See the formula, worked examples, conversion table, history, and common uses.
Imperial fluid ounces to Oil barrels converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
An oil barrel is 42 US gallons.
Result = input x 2.84130625e-5 / 0.1589872949.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial fluid ounces to Oil barrels
Imperial fluid ounce and Oil barrel appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Imperial fluid ounce is most often used for uk/commonwealth beverage measurement in historical or specialized contexts.
Formula
oil barrels = imperial fluid ounces × 0.000178712786533
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial fluid ounce equals 0.0000284130625 base units, and 1 oil barrel equals 0.158987294928 base units, so dividing one by the other gives the direct imperial fluid ounce-to-oil barrel factor of 0.000178712786533.
Simple example
1 imp fl oz × 0.0001787127865 = 0.0001787128 bbl
1 imperial fluid ounce = 0.0001787128 oil barrels.
Real-world example
10 imp fl oz × 0.0001787127865 = 0.0017871279 bbl
10 imperial fluid ounces = 0.0017871279 oil barrels.
Conversion table
| Imperial fluid ounce (imp fl oz) | Oil barrel (bbl) |
|---|---|
| 1 imp fl oz | 0.0001787128 bbl |
| 5 imp fl oz | 0.0008935639 bbl |
| 10 imp fl oz | 0.0017871279 bbl |
| 25 imp fl oz | 0.0044678197 bbl |
| 50 imp fl oz | 0.0089356393 bbl |
| 100 imp fl oz | 0.0178712787 bbl |
Reverse conversion: Oil barrel to Imperial fluid ounce
0.0001787128 bbl × 5595.570521 = 1.000000075 imp fl oz
0.0001787128 oil barrels = 1.000000075 imperial fluid ounces.
imperial fluid ounces = oil barrels × 5595.57052071
For a page dedicated to this direction, see Oil barrel to Imperial fluid ounce.
Understanding the Imperial fluid ounce
Imperial fluid ounce (imp fl oz) measures volume. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom (historically; less common in current UK retail than metric units)
Imperial fluid ounce vs. US fluid ounce. Confusingly, the imperial fluid ounce (28.41 mL) is slightly smaller than the US fluid ounce (29.57 mL), even though the imperial gallon is larger overall — because the imperial gallon is divided into 160 fluid ounces rather than the US gallon's 128.
Uses of the Imperial fluid ounce today
- UK/Commonwealth beverage measurement in historical or specialized contexts
History of the Imperial fluid ounce
The imperial fluid ounce follows from Britain's 1824 imperial gallon, divided into 160 parts rather than the 128 used in the US system, producing its counterintuitively smaller size relative to the US fluid ounce.
Historical origin. Imperial fluid ounce was not the invention of a single named person; it developed through the process described above.
Understanding the Oil barrel (bbl)
An oil barrel is 42 US gallons.
Imperial fluid ounce — sources
- UK Weights and Measures Act 1824 — Basis for the imperial fluid ounce via the imperial gallon.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many oil barrels are in 1 imperial fluid ounce?
1 imperial fluid ounce equals 0.0001787128 oil barrels, using the exact defined conversion factor rather than an estimate.
How do I convert imperial fluid ounce to oil barrel?
Multiply the imperial fluid ounce value by 0.0001787127865. The converter above does this instantly to whatever precision you set.
How do I convert oil barrel back to imperial fluid ounce?
Use the reverse factor: 1 oil barrel equals 5,595.570521 imperial fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a imperial fluid ounce?
Imperial fluid ounce (imp fl oz) measures volume. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. It is classified as a UK/imperial customary unit.
What is a oil barrel?
Oil barrel (bbl) is a unit of volume.
Is the imperial fluid ounce to oil barrel conversion exact?
Yes. The imperial fluid ounce is 1/160 of an imperial gallon: exactly 28.4130625 milliliters — slightly smaller than the US fluid ounce despite the larger imperial gallon, because it divides that gallon into more parts. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
What is the difference between imperial fluid ounce vs. us fluid ounce?
Confusingly, the imperial fluid ounce (28.41 mL) is slightly smaller than the US fluid ounce (29.57 mL), even though the imperial gallon is larger overall — because the imperial gallon is divided into 160 fluid ounces rather than the US gallon's 128.
Where is the imperial fluid ounce still used today?
United Kingdom (historically; less common in current UK retail than metric units)