!!! Overview
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The ISO standard paper sizes are not commonly used in the [United States] and [Canada]. 

Instead paper formats like 
* "Letter" (8.5 x 11 inches)
* "Legal" (8.5 x 14 inches)
* "Executive" (7 x 10 inches)
* "Ledger/Tabloid" (11 x 17 inches) 
are widely used. The "Letter", "Legal", "Tabloid", and other formats (although not by these names) are defined in the American National Standard [ANSI] X3.151.

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||US Imperial paper||Alias||ANSI||mm||inches||Ratio||Similar ISO||ISO mm||ISO Ratio
|Photo 4 x 6| | |102 x 152|4 x 6|
|Index Card 5 x 8| | |127 x 203|5 x 8| 
|Half Letter|Half Sheet| |139.7 x 215.9|5 1/2 x 8 1/2| 
|Executive|Executive| |184.2 x 266.7|7 x 10| 
|U.S. Government| | |203 x 267|8 x 10 1/2| 
|Folio, F4//Foolscap E|Folio| |210 x 330|8 x 13| 
|Letter, US A| |ANSI A|215.9 x 279.4|8 1/2 x 11|22⁄17 = 1.2941|A4|297 × 210|1.414
|Legal|Legal| |215.9 x 355.6|8 1/2 x 14|
|Ledger|Tabloid|ANSI B|279.4 x 431.8|11 x 17|17⁄11 = 1.5455|A3|297 × 420|1.414
| | |ANSI C|17 × 22|432 × 559|​22⁄17 = 1.2941|A2|420 × 594|1.414
| | |ANSI D|558.8 x 863.6|22 x 34|17⁄11 = 1.5455|A1|594 × 841|1.414
| | |ANSI E|863.6 x 1117.6|34 x 44
| | |ANSI F|28 × 40|711 × 1016|​10⁄7 = 1.4286|A0|841 × 1189|1.414
| | |ANSI G|11 × 22.5–90|279 × 572–2286|N/A|N/A|N/A|N/A
| | |ANSI H|28 × 44–143|711 × 1118–3632|N/A|N/A|N/A|N/A
| | |ANSI J|34 × 55–176|864 × 1397–4470|N/A|N/A|N/A|N/A
| | |ANSI K|40 × 55–143|1016 × 1397–3632|N/A|N/A|N/A|N/A
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