Comparison of the imperial and US customary measurement systems adopted a system based on the 231-cubic-inch wine gallon for all fluid purposes. This became the US fluid gallon. Both the imperial and US fluid gallon are divided into 4 quarts, 8 pints or 32 gills. However, whereas the US gill is divided into 4 US fluid ounces, the imperial gill is divided into 5 imperial fluid ounces. So whilst the imperial gallon, quart, pint and gill are about 20% larger than their US fluid measure counterparts, the fluid ounce is about 4% smaller. Note that one avoirdupois ounce of water has an approximate volume of one imperial fluid ounce
Pint in two sizes, colloquially known as "quarts" and "pints". They were 22 and 12 imperial ounces (625 and 341 ml), respectively, which were much smaller than the British units. Some provinces banned the sale of beer in the larger bottle. For example, in Ontario in the 1950s only the smaller size could be sold, but in Quebec both sizes were about equally common. The numerous incompatibilities between traditional Canadian, British, French, and American unit systems was one of the driving forces behind metrication in Canada. Draft beer in Canada, when advertised as a "pint", is legally required to be 568