In the United States, a unit of liquid capacity = ¼ U.S. liquid quart, about 237 milliliters. For purposes of food labeling, the FDA defines it as 240 mL (21 CFR 101.9(b)(5)(viii)).
In imperial measure, a unit of liquid capacity = ¼ imperial quart, about 284 milliliters.
In Sierra Leone, 20th century, a unit of capacity used for grain, approximately 333 milliliters. (UN, 1966)
In Australia, which uses the metric system, 20th century, the cup used in recipes has become 250 milliliters, 5.5% larger than the American cup, and 12% smaller than the old imperial cup. The cup is very likely to migrate to this value worldwide; most new graduated kitchen measures are already marked with a 250-mL level.
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Last revised: 24 September 2016.