A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms ℥, fl ℥, f℥, ƒ ℥) is a unit of volume (also called capacity) typically used for measuring liquids. Various definitions have been used throughout history, but only two are still in common use: the British Imperial and the United States customary fluid ounce. An imperial fluid ounce is  ¹⁄₂₀ of an imperial pint,  ¹⁄₁₆₀ of an imperial gallon or approximately 28.4 ml. A US fluid ounce is  ¹⁄₁₆ of a US fluid pint and  ¹⁄₁₂₈ of a US liquid gallon or approximately 29.57 ml, making it about 4% larger than the imperial fluid ounce.

Imperial fluid ounce

conversion table

The quart (abbreviation qt.) is an English unit of volume equal to a quarter gallon. It is divided into two pints or four cups. Historically, the exact size of the quart has varied with the different values of gallons over time and in reference to different commodities. Presently, three kinds of quarts remain in use: the liquid quart and dry quart of the US customary system and the imperial quart of the British imperial system. All are roughly equal to one metric liter.

Imperial quart

The imperial quart, used for both liquid or dry capacity, is equal to one quarter of an imperial gallon, or exactly 1.1365225 liters.

conversion table