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To convert US pints to milliliters, multiply by 473.176. So 1 US pint = 473.176 mL, 2 pints = 946.353 mL, and 0.5 pints = 236.588 mL. Important: the UK imperial pint is 568.261 mL — significantly larger than the US pint. A US pint is only 83.3% of a UK pint.
The pub pint is the most famous example of this difference. Order "a pint" of beer in London and you get 568 mL; order the same in New York and you get 473 mL. This 20% discrepancy affects restaurant portion sizes, homebrew recipes, and any recipe that cites pints without specifying US or UK.
Did you know? The UK "pint" is enshrined in law: it is the legal minimum measure for draught beer and cider sold in UK pubs. Selling less than 568 mL as a "pint" is a trading standards offence. US pint measures have no such legal definition for pubs.
Homebrewing beer from US or UK recipes requires precise mL measurements for yeast starters and hop additions. UK cocktail recipes specify pints of juice or mixer; these need mL equivalents for US bars. Blood and plasma donations are sometimes described in pints; hospital fluid replacement uses mL in all countries.