inch

Also known as in, ″, inches

The inch (symbol: in or prime (symbol)|) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to yard or of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate similar units in other measurement systems, usually understood as deriving from the width of the human thumb.

AI overview

An inch is a unit of length used in British Imperial and U.S. customary measurement systems, equal to one-twelfth of a foot. The term comes from the Roman word for "twelfth" and is sometimes used to describe similar units in other measurement systems, traditionally understood as roughly the width of a human thumb.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Unit.quantity: Length
Unit.image: Inch tape (cropped).jpg
Unit.caption: A measuring tape with inches
Unit.symbol: in
Unit.symbol2: (the double prime)
Unit.standard: Imperial/US units
Unit.units2: Metric (SI) units
Unit.inunits2: 25.4 mm
Unit.units1: Imperial/US units
Unit.inunits1:  yd or  ft

via Wikipedia infobox

Wikidata facts

Image: Inch tape.jpg

Show 9 more facts

conversion to standard unit: 0.000015783
Unicode character: ㏌
unit symbol: 英寸
conversion to SI unit: 0.0254
exact match: qudt.org/vocab/unit/IN
Wikidata SPARQL query equivalent: wd:Q218593 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
Commons category: Inch
NCI Thesaurus ID: C48500
P8168: Cabanès

Sources (2)

via Wikidata · CC0

~11 min read

Article

16 sections

Contents

Name
Usage
Imperial or hybrid countries
Worldwide
Technical details
Equivalents
History
Related units
US survey inches
Continental inches
Scottish inch
See also
Notes
References
Citations
Bibliography

Standards for the exact length of an inch have varied in the past, but since the adoption of the international yard during the 1950s and 1960s the inch has been based on the metric system and defined as exactly 25.4mm.