Editing Paper size (section)

=== 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}}
|}
-->