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A '''foot''' is a non-
SI unit of
distance or
length. The popular belief is that original standard was the length of a man's
foot. The average foot length is about 240
mm (9.4
in) for current Europeans. About 996 of 1000 British men have a foot that is less than 12 inches long. In medieval times, people were even smaller. A plausible explanation for the missing inches is that the measure did not refer to a naked foot, but to the length of footwear. This is consistent with the measure being convenient for practical purposes such as on building sites etc. People almost always pace out lengths whilst wearing shoes or boots, rather than removing them and pacing barefoot.
There are twelve
inches in one foot and three feet in one
yard.
The standardization of weights and measures has left several different standardized foot measures.
The most commonly used foot today is the
imperial foot, which is ''defined to be exactly'' 0.3048
metres. This unit is sometimes denoted with a
prime (e.g. 30′ means 30 feet), often approximated by an
apostrophe. Similarly,
inches can be denoted by a double prime (often approximated by a
quotation mark), so 6′2″ means 6 feet 2 inches.
The foot as a measure was used in almost all cultures. The first known standard foot measure was from
Sumeria, where a definition is given in a statue of
Gudea of
Lagash from around
2575 BC.
The imperial foot was adapted from an
Egyptian measure by the
Greeks, with a subsequent larger foot being adopted by the
Romans.
In addition to the current standard imperial foot, there is also a ''slightly different'' U.S. survey foot, used only by the
U.S. Coast and Geodetic Survey, defined as exactly 12 U.S. survey inches, approximately 30.48006 cm.
== See also ==
*
Historical weights and measures
*
weights and measures
*
inch for more on the survey inch
da:fod (lngdeenhed)
de:Foot
eo:Futo
es:Pie (unidad de longitud)
fr:Pied
nl:Foot
ja:フィート
ru:Фут
simple:Foot
sl:Čevelj
