Relationship To Other Units
Both the US liquid and imperial gallon are divided into four quarts (quarter gallons), which in turn are divided into two pints. These pints are divided into two cups (though the imperial cup is rarely used now), which in turn are divided into two gills (gills are also rarely used). Thus a gallon is equal to four quarts, eight pints, sixteen cups or thirty-two gills. The imperial gill is further divided into five fluid ounces whereas the US gill is divided into four fluid ounces. Thus an imperial fluid ounces is 1⁄20 of an imperial pint or 1⁄160 of an imperial gallon whilst a US fluid ounces is 1⁄16 of a US pint or 1⁄128 of a US gallon.
The imperial gallon, quart, pint, cup and gill are approximately 20% larger than their US counterparts and are therefore not interchangeable. The imperial fluid ounce, on the other hand, is only 4% smaller than the US fluid ounce and therefore they are often used interchangeably.
Read more about this topic: Gallon
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