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 glass glass holds 16 oz. to its rim. With a half inch of foam, the actual liquid fill is roughly 14 oz. Recently (as of 2008), some restaurants have replaced 16-ounce pint glasses (473 mL) with 14 ouncers (415 mL) to which customers have objected. In response to this, legislation has been introduced in the state of Michigan (known for its craft brewing culture) to require bars to serve 16-ounce pints. It is increasingly common to find pint glasses which contain markings on the base; very often these glasses are branded to one particular beer. The markings themselves are formed from