An imperial fluid ounce is 1/160 of an imperial gallon.
Imperial fluid ounces to Liters Converter — imp fl oz to L
Convert Imperial fluid ounce (imp fl oz) to Liter (L) using the exact conversion factor (1 imperial fluid ounce = 0.0284130625 liter). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial fluid ounces to Liters 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.
A liter is one cubic decimeter.
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 Liters
Imperial fluid ounce and Liter 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 typically associated with united Kingdom (historically; less common in current UK retail than metric units), while Liter is typically associated with standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts.
Formula
liters = 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 liter equals 0.001 base units, so dividing one by the other gives the direct imperial fluid ounce-to-liter factor of 0.0284130625.
Simple example
1 imp fl oz × 0.0284130625 = 0.0284130625 L
1 imperial fluid ounce = 0.0284130625 liters.
Real-world example
10 imp fl oz × 0.0284130625 = 0.284130625 L
10 imperial fluid ounces = 0.284130625 liters.
Conversion table
| Imperial fluid ounce (imp fl oz) | Liter (L) |
|---|---|
| 1 imp fl oz | 0.0284130625 L |
| 5 imp fl oz | 0.1420653125 L |
| 10 imp fl oz | 0.284130625 L |
| 25 imp fl oz | 0.7103265625 L |
| 50 imp fl oz | 1.420653125 L |
| 100 imp fl oz | 2.84130625 L |
Reverse conversion: Liter to Imperial fluid ounce
0.0284130625 L × 35.19507973 = 1 imp fl oz
0.0284130625 liters = 1 imperial fluid ounces.
imperial fluid ounces = liters × 35.1950797279
For a page dedicated to this direction, see Liter to Imperial fluid ounce.
Imperial fluid ounce vs. Liter
| Aspect | Imperial fluid ounce | Liter |
|---|---|---|
| Family | UK/imperial customary unit | Non-SI metric unit accepted for use with SI |
| Typical use | UK/Commonwealth beverage measurement in historical or specialized contexts | Beverage, fuel, and liquid product packaging worldwide |
| Where it's used | United Kingdom (historically; less common in current UK retail than metric units) | Standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts |
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 Liter
Liter (L) measures volume. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). It is classified as a Non-SI metric unit accepted for use with SI.
Where it's used: Standard volume unit for liquids worldwide, including in the US for beverages and fuel labeling in some contexts
Uses of the Liter today
- Beverage, fuel, and liquid product packaging worldwide
- Cooking and recipe measurement in metric countries
- Laboratory and scientific volume measurement
History of the Liter
The liter was introduced with the French metric system in 1795, originally defined as the volume of one kilogram of pure water at its freezing point — tying volume, mass, and the meter together.
Between 1901 and 1964, the liter was briefly redefined as the volume of exactly one kilogram of water at its maximum density (about 4 °C), which made it very slightly larger than a cubic decimeter. It was redefined back to exactly one cubic decimeter in 1964, the definition still used today.
Historical origin. Liter was not the invention of a single named person; it developed through the process described above.
Imperial fluid ounce — sources
- UK Weights and Measures Act 1824 — Basis for the imperial fluid ounce via the imperial gallon.
Liter — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Current cubic-decimeter definition of the liter.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many liters are in 1 imperial fluid ounce?
1 imperial fluid ounce equals 0.0284130625 liters, using the exact defined conversion factor rather than an estimate.
How do I convert imperial fluid ounce to liter?
Multiply the imperial fluid ounce value by 0.0284130625. The converter above does this instantly to whatever precision you set.
How do I convert liter back to imperial fluid ounce?
Use the reverse factor: 1 liter 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 liter?
Liter (L) measures volume. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). It is classified as a Non-SI metric unit accepted for use with SI.
Is the imperial fluid ounce to liter conversion exact?
Yes. A liter is defined as exactly one cubic decimeter (0.001 cubic meters). 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)