An imperial pint is one eighth of an imperial gallon.
Imperial pints to Gallons Converter — imp pt to gal
Convert Imperial pint (imp pt) to Gallon (gal) using the exact conversion factor (1 imperial pint = 0.1501187407 gallon). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Imperial pints to Gallons 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 US liquid gallon is exactly 3.785411784 liters.
Result = input x 0.00056826125 / 0.003785411784.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial pints to Gallons
Imperial pint and Gallon 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 pint is typically associated with united Kingdom, Ireland (beer and cider serving is legally defined in imperial pints), while Gallon is typically associated with united States (fuel, beverage, and liquid measurement).
Formula
gallons = imperial pints × 0.150118740688
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial pint equals 0.00056826125 base units, and 1 gallon equals 0.003785411784 base units, so dividing one by the other gives the direct imperial pint-to-gallon factor of 0.150118740688.
Simple example
1 imp pt × 0.1501187407 = 0.1501187407 gal
1 imperial pint = 0.1501187407 gallons.
Real-world example
10 imp pt × 0.1501187407 = 1.501187407 gal
10 imperial pints = 1.501187407 gallons.
Conversion table
| Imperial pint (imp pt) | Gallon (gal) |
|---|---|
| 1 imp pt | 0.1501187407 gal |
| 5 imp pt | 0.7505937034 gal |
| 10 imp pt | 1.501187407 gal |
| 25 imp pt | 3.752968517 gal |
| 50 imp pt | 7.505937034 gal |
| 100 imp pt | 15.01187407 gal |
Reverse conversion: Gallon to Imperial pint
0.1501187407 gal × 6.661393477 = 1 imp pt
0.1501187407 gallons = 1 imperial pints.
imperial pints = gallons × 6.66139347703
For a page dedicated to this direction, see Gallon to Imperial pint.
Imperial pint vs. Gallon
| Aspect | Imperial pint | Gallon |
|---|---|---|
| Family | UK/imperial customary unit | US customary unit |
| Typical use | UK and Irish pub beer/cider serving (a legally protected serving size) | Fuel pump and vehicle fuel-economy measurement in the US |
| Where it's used | United Kingdom, Ireland (beer and cider serving is legally defined in imperial pints) | United States (fuel, beverage, and liquid measurement) |
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.
Understanding the Gallon
Gallon (gal) measures volume. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is classified as a US customary unit.
Where it's used: United States (fuel, beverage, and liquid measurement)
US gallon vs. imperial gallon. The US liquid gallon (3.785411784 L) and the British imperial gallon (4.54609 L) are different units with the same name; always confirm which one a source is using.
Uses of the Gallon today
- Fuel pump and vehicle fuel-economy measurement in the US
- Beverage and liquid product packaging in the US
- Cooking and recipe measurement in US customary units
History of the Gallon
The US gallon descends from the English wine gallon of 231 cubic inches, a standard used for measuring wine in medieval and early modern England, which the American colonies inherited and retained even after England moved to a different imperial gallon in 1824.
England's 1824 Weights and Measures Act replaced the old wine gallon with a new imperial gallon (based on 10 pounds of water), but the US kept the older 231-cubic-inch definition — which is why the US gallon (3.785 L) and the imperial gallon (4.546 L) differ by about 20% today.
Historical origin. Gallon was not the invention of a single named person; it developed through the process described above.
Imperial pint — sources
- UK Weights and Measures Act 1985 — Maintains the imperial pint as the legal draught beer/cider serving measure.
Gallon — sources
- NIST Handbook 44, Appendix C — General tables of units of measurement, including the US gallon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gallons are in 1 imperial pint?
1 imperial pint equals 0.1501187407 gallons, using the exact defined conversion factor rather than an estimate.
How do I convert imperial pint to gallon?
Multiply the imperial pint value by 0.1501187407. The converter above does this instantly to whatever precision you set.
How do I convert gallon back to imperial pint?
Use the reverse factor: 1 gallon equals 6.661393477 imperial pints. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a gallon?
Gallon (gal) measures volume. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. It is classified as a US customary unit.
Is the imperial pint to gallon conversion exact?
Yes. The US liquid gallon is defined as exactly 231 cubic inches, equal to 3.785411784 liters. 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 imperial pint still used today?
United Kingdom, Ireland (beer and cider serving is legally defined in imperial pints)