Editing Paper size (section)

== Transitional paper sizes ==

=== PA4 or L4 ===

{| class="wikitable floatright"
|+ Hypothetical PA4-based series
! Name
! mm × mm !! inch × inch !!title="Aspect ratio"| AR
|-
! PA0
| {{size|840|1120|p=8|ar=on}}
|-
! PA1
| {{size|560|840|p=8|ar=on}}
|-
! PA2
| {{size|420|560|p=8|ar=on}}
|-
! PA3
| {{size|280|420|p=8|ar=on}}
|- style="font-weight: bolder"|
! PA4
| {{size|210|280|p=8|ar=on}}
|-
! PA5
| {{size|140|210|p=8|ar=on}}
|-
! PA6
| {{size|105|140|p=8|ar=on}}
|-
! PA7
| {{size|70|105|p=8|ar=on}}
|-
! PA8
| {{size|52|70|p=8|ar=on}}
|-
! PA9
| {{size|35|52|p=8|ar=on}}
|-
! PA10
| {{size|26|35|p=8|ar=on}}
|}

A transitional size called '''PA4''' ({{convert|210|×|280|mm|inch|2|abbr=on|disp=or}}), sometimes dubbed '''L4''', was proposed for inclusion into the ISO 216 standard in 1975. It has the height of Canadian P4 paper (215&nbsp;mm&nbsp;× 280&nbsp;mm, about {{frac|8|1|2}}&nbsp;in&nbsp;× 11&nbsp;in) and the width of international A4 paper ({{convert|210|×|297|mm|inch|2|abbr=on|disp=or}}), i.e. it uses the smaller value among the two for each side. The table shows how this format can be generalized into an entire format series.

The PA formats did not end up in ISO 216, because the committee decided that the set of standardized paper formats should be kept to the minimum necessary.{{citation needed|date=December 2016}} However, PA4 remains of practical use today. In [[landscape format|landscape]] orientation, it has the same 4:3 aspect ratio as the displays of traditional TV sets, some [[computer displays]] (e.g. the [[iPad]]) and [[data projector]]s. PA4, with appropriate [[margin (typography)|margin]]s is, therefore, a good choice as the format of presentation slides.

As a compromise between the two most popular paper sizes globally, PA4 is used today by many international magazines, because it can be printed easily on equipment designed for either A4 or US Letter. That means (in practice) it has turned out to be not so much a paper size as a page format. Apple, for instance, requires this format for digital music album booklets.<ref>{{cite web |url=https://help.apple.com/itc/videoaudioassetguide/#/itc585697a99 |title=Music Digital Booklet Profile | website=iTunes Video and Audio Asset Guide |author=Apple iTunes Store |date=2019}}</ref>

The size 210&nbsp;mm × 280&nbsp;mm was documented in the Canadian standard CAN2-200.2-M79 "Common Image Area for Paper Sizes P4 and A4".<ref>{{cite web |url=http://www.scc.ca/en/standardsdb/standards/2464 |title=CAN2-200.2-M79: "Common Image Area for Paper Sizes P4 and A4" |archive-url=https://web.archive.org/web/20170907123539/http://www.scc.ca/en/standardsdb/standards/2464 |archive-date=7 September 2017 |date=1 April 1979}} (NB. Withdrawn 1 March 2012.)</ref>

===F4<span class="anchor" id="Paper size F4"></span>===
{{see also|Foolscap folio#F4}}

{| class="wikitable floatright"
|+ Hypothetical F4-based series
|-
! Name
! mm × mm !! inch × inch !!title="Aspect ratio"| AR
|-
! F0
| {{size|841|1321|p=8|ar=on}}
|-
! F1
| {{size|660|841|p=8|ar=on}}
|-
! F2
| {{size|420|660|p=8|ar=on}}
|-
! F3
| {{size|330|420|p=8|ar=on}}
|- style="font-weight: bolder"|
! F4
| {{size|210|330|p=8|ar=on}}
|-
! F5
| {{size|165|210|p=8|ar=on}}
|-
! F6
| {{size|105|165|p=8|ar=on}}
|-
! F7
| {{size|82|105|p=8|ar=on}}
|-
! F8
| {{size|52|82|p=8|ar=on}}
|-
! F9
| {{size|41|52|p=8|ar=on}}
|-
! F10
| {{size|26|41|p=8|ar=on}}
|}
A non-standard '''F4''' paper size is common in Southeast Asia. It is a transitional size with the shorter side of ISO A4 (210&nbsp;mm, {{frac|8|1|4}} inch) and the longer side of British ''Foolscap'' ({{convert|13|in|mm|adj=on}}. ISO A4 is exactly 90% the height of F4.
This size is sometimes also known as [[#Foolscap|(metric) 'foolscap' or 'folio']].

In Indonesia, where F4 is the legally-mandated paper size for use in the printing of [[law of Indonesia|national legislation]], it is sometimes called ''Folio'' or ''HVS'' (from {{langx|nl|houtvrij schrijfpapier}}, "[[wood-free paper|wood-free]] writing paper"). 
In Philippines, it is commonly called ''long bond'' as opposed to ''short bond'' which refers to the US Letter paper size.

A sheet of F4 can be cut from a sheet of SRA4 with very little wastage. The size is also smaller than its [[#Swedish extensions|Swedish equivalent]] SIS F4 at 239&nbsp;mm × 338&nbsp;mm.

In some countries, the narrow side of F4 is slightly broader: 8.5 inches (216 mm) or 215 mm. It is then equivalent to<!--one variant of--> the US ''Government Legal'' and ''Foolscap Folio'' sizes.
In India, an amendment to the national standard IS 1064 from 2022<ref name="IS 1064 Amd 2 2022">{{cite web| url= https://archive.org/stream/gov.in.is.1064.1980/zIS1064Amd.2%3A2022_djvu.txt | title=IS 1064 (Second Revision)| date=1980}}</ref> records two metricated, originally inch-based sizes: '''FS''' at {{convert|215|×|345|mm|inch|2|abbr=on}} and ''Legal'' with the same width and a height of either {{convert|335|mm|in}} or {{convert|355|mm|in}}, i.e. 1 cm less or more than FS. Due to their predominant use, printer manufacturers and vendors have dubbed these sizes ''Indian Legal'' or ''Legal (India)''.<ref name="brother">{{cite web|url=https://support.brother.com/g/b/sp/faqend.aspx?c=us&lang=en&prod=mfcj5945dw_us_eu_as&faqid=faq00100517_503| publisher =Brother | title =Paper Type and Size for Each Operation}}</ref><!--replace by IPP source when standardized, expected in mid-2025-->
In Mexico, the length of a similar size, likewise known as ''Mexican Legal'' or ''Legal (Mexico)'', has been rounded to 340 mm.<ref name="brother"/>

==={{lang|de|Weltformat}}===

The {{lang|de|Weltformat}} ('world format') was developed by German chemist [[Wilhelm Ostwald]] in 1911 as part of [[Die Brücke (institute)|Die Brücke]], around the same time DIN 476 was first discussed. It shares the same design primitives, especially the aspect ratio, but is based upon 1 cm as the short edge of the smallest size. Sizes were designated by roman numerals. The result, for the fourth through fourteenth size, is close to the DIN/ISO C series.<ref>{{cite news|author=Wilhelm Ostwald|title=Die Weltformate: I. Für Drucksachen|url=https://archive.org/details/DieWeltformate|publisher=Seybold|location=Ansbach|oclc=255038683|newspaper=[[Börsenblatt für den Deutschen Buchhandel]]|date=18 October 1911|issue=243|page= 12330}}</ref><ref>{{cite book|author=Karl Wilhelm Bührer|title=Raumnot und Weltformat: Schriften über Die Brücke|volume=Band 2|publisher=Seybold|location=München / Ansbach |year=1912|oclc=253384402}}</ref>

{| class="wikitable" 
|+ Original world format sizes with equivalent C-series format
|-
! {{lang|de|Weltformat}} 
! mm × mm !! inch × inch 
! DIN 
|-
|I ||{{size|10|14|p=8}}|| 
|-
|II ||{{size|14|20|p=8}}|| 
|-
|III ||{{size|20|28|p=8}}|| 
|-
|IV ||{{size|28|40|p=8}}|| C10
|- 
|V ||{{size|40|57|p=8}}|| C9
|- 
|VI ||{{size|57|80|p=8}}|| C8
|- 
|VII ||{{size|80|113|p=8}}|| C7
|-
|VIII ||{{size|113|160|p=8}}|| C6
|-
|IX ||{{size|160|226|p=8}}|| C5
|-
|X ||{{size|226|320|p=8}}|| C4
|-
|XI||{{size|320|453|p=8}}|| C3
|- 
|XII ||{{size|453|640|p=8}}|| C2
|-
|XIII ||{{size|640|905|p=8}}|| C1
|- style="font-weight: bolder"|
|XIV ||{{size|905|1280|p=8}}|| C0
|-
|XV ||{{size|1280|1810|p=8}}|| 
|-
|XVI ||{{size|1810|2560|p=8}}|| 
|}

The sizes have been used for some print products in the early 20th century in central Europe but got replaced by DIN sizes almost entirely. However, it was successfully adopted from 1913 onwards for posters and placards in Switzerland. Even today, the default size for posters in Swiss advertisements, F4, is colloquially known as {{lang|de|Weltformat}}, although it measures 895 mm × 1280 mm, i.e. 1 cm less than size XIV.<ref name="APG">[https://www.apgsga.ch/en/templates-and-specifications/ APG|SGA: Templates and specifications]</ref> This poster size goes alongside F12 {{lang|de|Breitformat}} 2685 mm × 1280 mm (3 × F4) and F24 {{lang|de|Großformat}} 2685 mm × 2560 mm (2 × 3 × F4), as well as F200 "Cityformat" 1165 mm × 1700 mm.

=== A0a ===
Though many countries have moved towards adopting ISO metric paper sizes, the transition towards this has led to at least one new paper size that differs slightly to those used internationally. British architects and industrial designers once used a size called "Antiquarian", {{convert|31|×|53|inch|mm|0|abbr=on}}, as listed [[#Traditional inch-based paper sizes|above]], but given in the ''New Metric Handbook'' (Tutt & Adler 1981) as {{convert|813|×|1372|mm|inch|0|abbr=on}} for board size. This size is a little larger than ISO A0 (841&nbsp;mm x 1189&nbsp;mm), and for a short time, a size called A0a of {{convert|1000|x|1370|mm|in|1}} was used in Britain, which was in reality a slightly shorter version of ISO B0 (1414&nbsp;mm).

=== Pliego ===

{| class="wikitable floatright"
|+ Colombian metric paper sizes<ref>{{cite book |last1=Consuegra |first1=David |title=En busca del cuadrado |date=1992 |publisher=Editorial Universidad Nacional de Colombia |location=Bogotá |isbn=9789581700882 |pages=84–85 |url=https://books.google.com/books?id=CWTijWVrt3sC&pg=PA84 |access-date=19 April 2023}}</ref>
! Size
! mm × mm !! inch × inch !!title="aspect ratio"| AR
|-
! Pliego
| {{size|700|1000|p=4|ar=on}}
|-
! {{frac|2}} pliego
| {{size|500|700|p=4|ar=on}}
|-
! {{frac|4}} pliego
| {{size|350|500|p=4|ar=on}}
|-
! {{frac|8}} pliego
| {{size|250|350|p=4|ar=on}}
|}

The most common paper sizes used for commercial and industrial printing in Colombia<!-- other South-American countries as well? --> are based upon a size referred to as ''pliego'' that is ISO B1 (707&nbsp;mm × 1000&nbsp;mm) cut to full decimetres. Smaller sizes are derived by halving, and are indicated by a [[vulgar fraction]] prefix, such as ''{{frac|2}} pliego'' and ''{{frac|4}} pliego''.

=== K<span class="anchor" id="8K"></span><span class="anchor" id="16K"></span><span class="anchor" id="East-Asian sizes"></span><span class="anchor" id="Shrikoban"></span><span class="anchor" id="Chrysanthemum"></span>===
{{refimprove|section|reason=Good sources are rare, especially in English.|date=May 2021}}

In East Asia – Japan, Taiwan, and China in particular – there are a number of similar paper sizes in common use for book-making and other purposes. A single designation is often used with slightly different edge measurements: the base sheet is labelled 1K (or {{lang|zh|1开}}, where ''K'' standards for {{zh|s=开本|l=[[folio]]|p=kāiběn}}, or {{lang|ja|1切/1取}} in Japanese); all smaller sizes are derived by halving the power of 2 number, ''i'' = 2{{sup|''n''}}, in front of the uppercase letter ''K''. The number in ISO designations, in contrast, is the exponent ''n'' that would yield the number of sheets cut from the base sizes.

The sizes of such folios depend on the base sheet. Pre-metric standards include:

* The imperial {{nihongo||菊判|kiku-ban}}, named after the ''[[Chrysanthemum]]'' watermark on imperial paper, measuring 636&nbsp;mm × 939&nbsp;mm.
* The four-by-six {{nihongo||四六判|shiroku-ban}} ('''4×6''' or '''4/6'''), where the final size at 32K was measured 4 by 6 {{transliteration|ja|[[cun (unit)|sun]]}} in [[Japanese units of measurement|Japan]], roughly {{resx|121|181}}&nbsp;mm, or slightly more, {{resx|127 or 130|188}} mm i.e. {{resx|4.2 or 4.3|6.2}} {{transliteration|ja|sun}}.
** In Taiwan, the traditional base size 1K inherited from Japan is sometimes quoted as measuring {{resx|31|43}} inches exactly, which is off by roughly 1 millimetre from the commonly quoted metric base size of {{resx|788|1091}}&nbsp;mm, which is directly derived from {{resx|26|36}} {{transliteration|ja|sun}} or {{resx|2.6|3.6}} {{transliteration|ja|[[shaku (unit)|shaku]]}}.
* The three-by-five {{lang|ja|三五判}} ('''3×5''' or '''3/5'''), where the final size at 32K is slightly less than 3 by 5 {{transliteration|ja|sun}}, often given as {{resx|84|148}}&nbsp;mm which would be approximately {{resx|2.8|4.9}} {{transliteration|ja|sun}}.

The 4/6 standard has given rise to newer metric book-size standards, including:

* The modern Japanese size for books, simply labeled ''B'' and is specified as {{resx|765|1085}}&nbsp;millimetres. It is not directly related to the similar [[#Japanese alternative|JIS B series]], where B1 is slightly smaller.
* The Chinese [[#Chinese extensions|SAC D series]].
{{Cleanup section|reason=Table is overly focused on 4/6 and similar sizes. Makes for a "uniform" comparison, but is not exactly right.|date=August 2021}}
{| class="wikitable"
|+ Traditional East-Asian ''Kai'' or 2{{sup|''n''}}K paper sizes with comparable modern sizes, all in (mm × mm)
! || colspan="2" | 4/6|| colspan="2" rowspan="2" | Taiwanese finishes (trimmed 4/6)	|| rowspan="2" | Japan Kai	
! colspan="2" rowspan="2" |Japanese finishes|| rowspan="2" | JIS B	|| colspan="2" rowspan="2" | JIS P 0138	|| colspan="3" | SAC	
|-
!
!{{transliteration|ja|Shaku}}-based 
!Inch-based 
!
!Trimmed
!Untrimmed
|----
! 1K
| 788 × 1091 || 787 × 1092 || 758 × 1060 || 760 × 1040 || {{n/a}} || {{n/a}} || {{n/a}} || title="B" |  765 × 1085
! B1
| 728 × 1030
! D0
| 764 × 1064 || 780 × 1080
|----
! 2K
| 545 × 788	|| 546 × 787 || 530 × 758 || 520 × 760 || {{n/a}} || {{n/a}} || {{n/a}} || (542 × 765)
! B2
| 515 × 728
! D1
| 532 × 760	|| 540 × 780
|----
! 4K
| 394 × 545	|| 394 × 546 || 379 × 530 || 380 × 520 || {{n/a}} || {{n/a}} || {{n/a}} || (382 × 542)
! B3
| 364 × 515
! D2
| 380 × 532	|| 390 × 540
|----
! 8K
| 272 × 394	|| 273 × 394 || 265 × 379 || 260 × 380 || title="Pa Kai" | 267 × 389 || title="Dai Pa Kai" | 275 × 395 || 264 × 379 || (271 × 382)
! B4
| 257 × 364
! D3
| 264 × 376	|| 270 × 390
|----
! 16K
| 197 × 272	|| 197 × 273 || 189 × 265 || 190 × 260 || {{n/a}} || title="Juuro Ku Kai" | 198 × 275 || 189 × 262 || (191 × 271)
! B5
| title="AB is 210 × 257, from ISO A4" | 182 × 257
! D4
| 188 × 260	|| 195 × 270
|----
! title="4/6" | 32K
| 136 × 197	|| 137 × 197 || 132 × 189 || 130 × 190 || title="4/6: 4.3 × 6.2 {{transliteration|ja|sun}}" | 130 × 188 || {{n/a}} || title="{{transliteration|ja|Shirokoban}}, 4/6: 4.2 × 6.2 {{transliteration|ja|sun}}" | 127 × 188 || (135 × 191)
! B6
| title="B40 is 103 × 182" | 128 × 182
! D5
| 130 × 184	|| 135 × 195
|----
! 64K
|  98 × 136	||  98 × 137 || 94 × 132 || 95 × 130 || {{n/a}} || {{n/a}} || {{n/a}} || {{n/a}}
! B7
|  91 × 128
! D6
|  92 × 130	||  97 × 135
|----
! 128K
| colspan="2" |  68 × 98 || 66 ×  94 || 65 ×  95 || {{n/a}} || {{n/a}} || {{n/a}} || {{n/a}}
! B8
|  64 ×  91	|| {{n/a}} || (65 × 92) || (67 × 97)
|}
<!--
{| class="wikitable"
|+ Traditional East-Asian ''Chrysanthemum'' or 2<sup>''n''</sup>K paper sizes
! 	|| sun × sun || inch × inch
|----
! 1K
| 24 × 32	|| 31 × 43
|----
! 2K
| 16 × 24	|| {{frac|21|1|2}} × 31
|----
! 4K
| 12 × 16	|| {{frac|15|1|2}} × {{frac|21|1|2}}
|----
! 8K
| 8 × 12	|| {{frac|10|3|4}} × {{frac|15|1|2}}
|----
! 16K
| 6 × 8	|| {{frac|7|1|4}} × {{frac|10|3|4}}
|----
! 32K
| 4 × 6	|| {{frac|5|3|8}} × {{frac|7|1|4}}
|----
! 64K
| 3 × 4	|| {{frac|3|5|8}} × {{frac|5|3|8}}
|----
! 128K
| 2 × 3	|| {{frac|2|11|16}} × {{frac|3|5|8}}
|}
-->