A US fluid ounce is 1/128 of a US gallon.
Fluid ounces to Imperial pints Converter — fl oz to imp pt
Convert Fluid ounce (fl oz) to Imperial pint (imp pt) using the exact conversion factor (1 fluid ounce = 0.0520421365 imperial pint). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Fluid ounces to Imperial pints 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 imperial pint is one eighth of an imperial gallon.
Result = input x 2.95735296e-5 / 0.00056826125.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Fluid ounces to Imperial pints
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. Fluid ounce is typically associated with united States (beverage, nutrition labeling), while Imperial pint is typically associated with united Kingdom, Ireland (beer and cider serving is legally defined in imperial pints).
Formula
imperial pints = fluid ounces × 0.0520421365393
This factor comes from each unit's defined relationship to the category's base unit: 1 fluid ounce equals 0.0000295735295625 base units, and 1 imperial pint equals 0.00056826125 base units, so dividing one by the other gives the direct fluid ounce-to-imperial pint factor of 0.0520421365393.
Simple example
1 fl oz × 0.05204213654 = 0.0520421365 imp pt
1 fluid ounce = 0.0520421365 imperial pints.
Real-world example
10 fl oz × 0.05204213654 = 0.5204213654 imp pt
10 fluid ounces = 0.5204213654 imperial pints.
Conversion table
| Fluid ounce (fl oz) | Imperial pint (imp pt) |
|---|---|
| 1 fl oz | 0.0520421365 imp pt |
| 5 fl oz | 0.2602106827 imp pt |
| 10 fl oz | 0.5204213654 imp pt |
| 25 fl oz | 1.301053413 imp pt |
| 50 fl oz | 2.602106827 imp pt |
| 100 fl oz | 5.204213654 imp pt |
Reverse conversion: Imperial pint to Fluid ounce
0.0520421365 imp pt × 19.21519881 = 0.9999999992 fl oz
0.0520421365 imperial pints = 0.9999999992 fluid ounces.
fluid ounces = imperial pints × 19.2151988081
For a page dedicated to this direction, see Imperial pint to Fluid ounce.
Fluid ounce vs. Imperial pint
| Aspect | Fluid ounce | Imperial pint |
|---|---|---|
| Family | US customary unit | UK/imperial customary unit |
| Typical use | US beverage container sizing (soda, water bottles) | UK and Irish pub beer/cider serving (a legally protected serving size) |
| Where it's used | United States (beverage, nutrition labeling) | United Kingdom, Ireland (beer and cider serving is legally defined in imperial pints) |
Understanding the Fluid ounce
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US customary unit.
Where it's used: United States (beverage, nutrition labeling)
Uses of the Fluid ounce today
- US beverage container sizing (soda, water bottles)
- US nutrition and medication dosing labels
History of the Fluid ounce
The US fluid ounce follows from the same English wine-gallon system as the rest of the US liquid volume units, defined as a consistent fraction of the gallon.
Historical origin. 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.
Fluid ounce — sources
- NIST Handbook 44, Appendix C — General tables of units including the US fluid ounce definition.
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 fluid ounce?
1 fluid ounce equals 0.0520421365 imperial pints, using the exact defined conversion factor rather than an estimate.
How do I convert fluid ounce to imperial pint?
Multiply the fluid ounce value by 0.05204213654. The converter above does this instantly to whatever precision you set.
How do I convert imperial pint back to fluid ounce?
Use the reverse factor: 1 imperial pint equals 19.21519881 fluid ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a fluid ounce?
Fluid ounce (fl oz) measures volume. The US fluid ounce is 1/128 of a US gallon: exactly 29.5735295625 milliliters. It is classified as a US 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 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 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.
Where is the fluid ounce still used today?
United States (beverage, nutrition labeling)