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.
United Nations, 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 at a 250-mL level.
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Last revised: 24 September 2016.