in a number of different systems， including English units， A foot (plural: feet or foot;[1] symbol or abbreviation: ft or， but in each is around a quarter to a third of a metre. The most commonly used foot today is the international foot. There are 3 feet in a yard and 12 inches in a foot. See all conversions for feet here. ， ′ – a prime) is a unit of length， sometimes，。
and United States customary units. Its size can vary from system to system， Imperial units。