An imperial fluid ounce is 1/160 of an imperial gallon.
Imperial fluid ounces to Cubic Decimeters Converter — imp fl oz to dm3
Convert Imperial fluid ounce (imp fl oz) to Cubic Decimeter (dm3) using the exact conversion factor (1 imperial fluid ounce = 0.0284130625 cubic decimeter). See the formula, worked examples, conversion table, history, and common uses.
Imperial fluid ounces to Cubic Decimeters 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.
Cubic metric volume unit.
Result = input x 2.84130625e-5 / 0.001.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial fluid ounces to Cubic Decimeters
Imperial fluid ounce and Cubic Decimeter 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
cubic decimeters = imperial fluid ounces × 0.0284130625
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 cubic decimeter equals 0.001 base units, so dividing one by the other gives the direct imperial fluid ounce-to-cubic decimeter factor of 0.0284130625.
Simple example
1 imp fl oz × 0.0284130625 = 0.0284130625 dm3
1 imperial fluid ounce = 0.0284130625 cubic decimeters.
Real-world example
10 imp fl oz × 0.0284130625 = 0.284130625 dm3
10 imperial fluid ounces = 0.284130625 cubic decimeters.
Conversion table
| Imperial fluid ounce (imp fl oz) | Cubic Decimeter (dm3) |
|---|---|
| 1 imp fl oz | 0.0284130625 dm3 |
| 5 imp fl oz | 0.1420653125 dm3 |
| 10 imp fl oz | 0.284130625 dm3 |
| 25 imp fl oz | 0.7103265625 dm3 |
| 50 imp fl oz | 1.420653125 dm3 |
| 100 imp fl oz | 2.84130625 dm3 |
Reverse conversion: Cubic Decimeter to Imperial fluid ounce
0.0284130625 dm3 × 35.19507973 = 1 imp fl oz
0.0284130625 cubic decimeters = 1 imperial fluid ounces.
imperial fluid ounces = cubic decimeters × 35.1950797279
For a page dedicated to this direction, see Cubic Decimeter 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 Cubic Decimeter (dm3)
Cubic metric volume unit.
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 cubic decimeters are in 1 imperial fluid ounce?
1 imperial fluid ounce equals 0.0284130625 cubic decimeters, using the exact defined conversion factor rather than an estimate.
How do I convert imperial fluid ounce to cubic decimeter?
Multiply the imperial fluid ounce value by 0.0284130625. The converter above does this instantly to whatever precision you set.
How do I convert cubic decimeter back to imperial fluid ounce?
Use the reverse factor: 1 cubic decimeter equals 35.19507973 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 cubic decimeter?
Cubic Decimeter (dm3) is a unit of volume.
Is the imperial fluid ounce to cubic decimeter 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)