What is the difference between us and UK pints?

The pint is defined as one eighth of a gallon. Other versions of the gallon were defined for different commodities, and there were equally many versions of the pint.

America adopted the British wine gallon (defined in 1707 as 231 cubic inches exactly (3 in × 7 in × 11 in)) as its basic liquid measure, from which the U.S. wet pint is derived, and the British corn gallon (? of a standard "Winchester" bushel or 268.8 cubic inches) as its dry measure, from which theUS dry pint is derived.

In 1824 the British parliament replaced all its variant gallons with a new imperial gallon based on tenpounds of distilled water at 62°F (277.42 cubic inches), from which the UK pint is derived.