Foot (unit)

===Metric foot===

An [[ISO 2848]] measure of 3 basic modules (30&nbsp;cm) is called a "[[metric foot]]",{{Cn|date=May 2023|reason=this association with ISO 2848 needs sourcing}} but there were earlier distinct definitions of a metric foot during [[metrication]] in France and Germany.

====France====

In 1799 the metre became the official unit of length in [[France]]. This was not fully enforced, and in 1812 [[Napoleon]] introduced the system of ''[[mesures usuelles]]'' which restored the traditional French measurements in the retail trade, but redefined them in terms of metric units. The foot, or ''pied métrique'', was defined as one third of a metre. This unit continued in use until 1837.<ref name="historique">{{cite web
 |url         = http://www.industrie.gouv.fr/metro/aquoisert/metre.htm
 |title       = Un historique du mètre
 |language    = fr
 |author      = Denis Février
 |publisher   = Ministère de l'Économie, des Finances et de l'Industrie
 |access-date  = March 10, 2011
|url-status  = live
 |archive-url  = https://web.archive.org/web/20110228185545/http://www.industrie.gouv.fr/metro/aquoisert/metre.htm
 |archive-date = February 28, 2011
|df          = mdy-all
}}</ref>

====Germany====

In southwestern Germany in 1806, the [[Confederation of the Rhine]] was founded and three different ''reformed feet'' were defined, all of which were based on the metric system:<ref name="DE1842">{{cite web
 |url         = http://www.spasslernen.de/geschichte/groessen/mas4.htm
 |language    = de
 |title       = Amtliche Maßeinheiten in Europa 1842
 |trans-title = Official measures in Europe 1842
 |access-date  = September 22, 2012
|url-status  = live
 |archive-url  = https://web.archive.org/web/20130723074500/http://www.spasslernen.de/geschichte/groessen/mas4.htm
 |archive-date = July 23, 2013
|df          = mdy-all
}}</ref>
*In [[Hesse]], the ''Fuß'' (foot) was redefined as 25&nbsp;cm.
*In [[Baden]], the ''Fuß'' was redefined as 30&nbsp;cm.
*In the [[Palatinate (region)|Palatinate]], the ''Fuß'' was redefined as being {{sfrac|33|1|3}}&nbsp;cm (as in France).