An imperial fluid ounce is 1/160 of an imperial gallon.
Imperial fluid ounces to Imperial pints Converter — imp fl oz to imp pt
Convert Imperial fluid ounce (imp fl oz) to Imperial pint (imp pt) using the exact conversion factor (1 imperial fluid ounce = 0.05 imperial pint). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial fluid ounces to Imperial pints converter
Converter
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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 imperial pint is one eighth of an imperial gallon.
Result = input x 2.84130625e-5 / 0.00056826125.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial fluid ounces to Imperial pints
Imperial fluid ounce and Imperial pint 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 Imperial pint is typically associated with united Kingdom, Ireland (beer and cider serving is legally defined in imperial pints).
Formula
imperial pints = imperial fluid ounces × 0.05
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 imperial pint equals 0.00056826125 base units, so dividing one by the other gives the direct imperial fluid ounce-to-imperial pint factor of 0.05.
Simple example
1 imp fl oz × 0.05 = 0.05 imp pt
1 imperial fluid ounce = 0.05 imperial pints.
Real-world example
10 imp fl oz × 0.05 = 0.5 imp pt
10 imperial fluid ounces = 0.5 imperial pints.
Conversion table
| Imperial fluid ounce (imp fl oz) | Imperial pint (imp pt) |
|---|---|
| 1 imp fl oz | 0.05 imp pt |
| 5 imp fl oz | 0.25 imp pt |
| 10 imp fl oz | 0.5 imp pt |
| 25 imp fl oz | 1.25 imp pt |
| 50 imp fl oz | 2.5 imp pt |
| 100 imp fl oz | 5 imp pt |
Reverse conversion: Imperial pint to Imperial fluid ounce
0.05 imp pt × 20 = 1 imp fl oz
0.05 imperial pints = 1 imperial fluid ounce.
imperial fluid ounces = imperial pints × 20
For a page dedicated to this direction, see Imperial pint to Imperial fluid ounce.
Imperial fluid ounce vs. Imperial pint
| Aspect | Imperial fluid ounce | Imperial pint |
|---|---|---|
| Family | UK/imperial customary unit | UK/imperial customary unit |
| Typical use | UK/Commonwealth beverage measurement in historical or specialized contexts | UK and Irish pub beer/cider serving (a legally protected serving size) |
| Where it's used | United Kingdom (historically; less common in current UK retail than metric units) | United Kingdom, Ireland (beer and cider serving is legally defined in imperial pints) |
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 Imperial pint
Imperial pint (imp pt) measures volume. The imperial pint is one-eighth of an imperial gallon: exactly 0.56826125 liters — notably the standard UK beer serving size. It is classified as a UK/imperial customary unit.
Where it's used: United Kingdom, Ireland (beer and cider serving is legally defined in imperial pints)
Imperial pint vs. US pint. The imperial pint (568 mL) is about 20% larger than the US pint (473 mL) — a British 'pint of beer' is meaningfully more beer than an American one.
Uses of the Imperial pint today
- UK and Irish pub beer/cider serving (a legally protected serving size)
- UK milk delivery (historically and in some contexts still)
History of the Imperial pint
The imperial pint follows from Britain's 1824 imperial gallon; it remains legally protected as the mandatory serving measure for draught beer and cider in UK and Irish pubs, one of the few contexts where imperial units remain legally mandated in the UK's otherwise largely metric system.
Historical origin. Imperial pint 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.
Imperial pint — sources
- UK Weights and Measures Act 1985 — Maintains the imperial pint as the legal draught beer/cider serving measure.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial pints are in 1 imperial fluid ounce?
1 imperial fluid ounce equals 0.05 imperial pints, using the exact defined conversion factor rather than an estimate.
How do I convert imperial fluid ounce to imperial pint?
Multiply the imperial fluid ounce value by 0.05. The converter above does this instantly to whatever precision you set.
How do I convert imperial pint back to imperial fluid ounce?
Use the reverse factor: 1 imperial pint equals 20 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 imperial pint?
Imperial pint (imp pt) measures volume. The imperial pint is one-eighth of an imperial gallon: exactly 0.56826125 liters — notably the standard UK beer serving size. It is classified as a UK/imperial customary unit.
Is the imperial fluid ounce to imperial pint conversion exact?
Yes. The imperial pint is one-eighth of an imperial gallon: exactly 0.56826125 liters — notably the standard UK beer serving size. 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)