Editing Envelope (section)

== Sizes ==

=== International standard sizes <!--'ISO 269 redirects here'--> ===
[[International standard]] '''ISO 269''' (withdrawn in 2009 without replacement<ref>{{Cite web |title=A4 Letter or Legal |url=https://noidue.de/en/a4-letter-or-legal/ |access-date=2022-10-09 |website=Noidue |language=en-US}}</ref>) defined several standard envelope sizes, which are designed for use with [[ISO 216]] standard [[paper sizes]]:

{| class="wikitable sortable"
|+ International standard envelope sizes
|-
! Format !! Dimensions (mm) !! Dimensions (in) !! [[Aspect ratio|AR]] !! Suitable content format
|-
!title="designated long"| DL <!--(M65){{qn}}-->
| {{size|110|220|ar=on}} || {{frac|1|3}} A4
|-
! C7
| {{size|81|114|ar=1.414}} || A7 (or {{frac|1|2}} A6)
|-
! C7/C6
| {{size|81|162|ar=on}} || {{frac|1|3}} A5
|-
! C6
| {{size|114|162|ar=1.414}} || A6 (or {{frac|1|2}} A5 or {{frac|1|4}} A4)
|-
! C6/C5
| {{size|114|229|ar=2}} || {{frac|1|3}} A4
|-
! C5
| {{size|162|229|ar=on}} || A5 (or {{frac|1|2}} A4)
|-
! C4
| {{size|229|324|ar=1.414}} || A4
|-
! C3
| {{size|324|458|ar=1.414}} || A3
|-
! B6
| {{size|125|176|ar=1.414}} || C6
|-
! B5
| {{size|176|250|ar=1.414}} || C5
|-
! B4
| {{size|250|353|ar=1.414}} || C4
|-
! E4
| {{size|280|400|ar=on}} || B4
|}
The German standard [[Deutsches Institut für Normung|DIN]] 678 defines a similar list of envelope formats.

DL comes from the DIN Lang (German: "Long") size envelope which originated in the 1920s.

=== North American sizes ===
There are dozens of sizes of envelopes available in the United States.

The designations such as "A2" do not correspond to ISO paper sizes. Sometimes, North American paper jobbers and printers will insert a hyphen to distinguish from ISO sizes, thus: A-2.

{| class="wikitable sortable"
|+ North American standard envelope sizes
|-
! Format !! Dimensions (in) !! Dimensions (mm) !! {{abbr|AR|Aspect ratio}} !! Suitable content format
|-
! A2 (Lady Grey)
| {{size|4+3/8|5+3/4|in|mm|ar=on}} || Letter paper folded twice ({{resx|{{frac|4|1|4}}|{{frac|5|1|2}}}})
|-
! A6 (Thompson Standard)<!--PWG?-->
| {{size|4+3/4|6+1/2|in|mm|ar=on}} || A2
|-
! A7 (Besselheim)<!--PWG?-->
| {{size|5+1/4|7+1/4|in|mm|ar=on}} || A6
|-
! A8 (Carrs)<!--PWG?-->
| {{size|5+1/2|8+1/8|in|mm|ar=on}} || A7
|-
! A9 (Diplomat)<!--PWG?-->
| {{size|5+3/4|8+3/4|in|mm|ar=on}} || Letter paper folded once ({{resx|{{frac|5|1|2}}|{{frac|8|1|2}}}}), A8
|-
! A10 (Willow)<!--PWG?-->
| {{size|6|9+1/2|in|mm|ar=on}} || 
|-
! C5
| {{size|6+1/2|9+1/2|in|mm|ar=on}} || 
|-
! No. {{frac|6|3|4}} (Personal)
| {{size|3+5/8|6+1/2|in|mm|ar=on}} || Personal check, US currency
|-
! No. {{frac|7|3|4}} (Monarch)
| {{size|3+7/8|7+1/2|in|mm|ar=on}} || 
|-
! No. 9 (A long)
| {{size|3+7/8|8+7/8|in|mm|ar=on}} || 
|-
! No. 10 (Business, Commercial)
| {{size|4+1/8|9+1/2|in|mm|ar=on}} || No. 9; letter paper folded into thirds ({{resx|{{frac|3|2|3}}|{{frac|8|1|2}}}})
|-
! No. 11
| {{size|4+1/2|10+3/8|in|mm|ar=on}} || No. 10
|-
! No. 12
| {{size|4+3/4|11|in|mm|ar=on}} || No. 11
|-
! No. 14
| {{size|5|11+1/2|in|mm|ar=on}} || No. 12
|}

The No. 10 envelope is the standard business envelope size in the United States.<ref>{{cite web |url=https://www.paperpapers.com/envelope-size-chart.html |title=Envelope Size Chart - Help understanding envelope sizes. |publisher=PaperPapers.com |year=2018 |access-date=13 February 2018 }}</ref>
PWG 5101.1<ref name="pwg"/> also lists the following even inch sizes for envelopes: {{resx|6|9}}, {{resx|7|9}}, {{resx|9|11}}, {{resx|9|12}}, {{resx|10|13}}, {{resx|10|14}} and {{resx|10|15}}.

Envelopes accepted by the U.S. Postal Service for mailing at the price of a letter must be:

* Rectangular
* At least {{frac|3|1|2}}&nbsp;inches high × 5&nbsp;inches long × 0.007&nbsp;inch thick.
* No more than {{frac|6|1|8}}&nbsp;inches high × {{frac|11|1|2}}&nbsp;inches long × {{frac|1|4}}&nbsp;inch thick.<ref>{{cite web |url=https://pe.usps.com/businessmail101?ViewName=Letters |title=Sizes for Letters |publisher=[[United States Postal Service|USPS]] |year=2016 |access-date=24 December 2016 }}</ref>
* Letters that have a length-to-height aspect ratio of less than 1.3 or more than 2.5 are classified as "non-machinable" by the USPS and may cost more to mail.<ref>{{cite web |url=https://pe.usps.com/cpim/ftp/manuals/qsg300/Q201.pdf |title=Physical Standards for Commercial Letters and Postcards |publisher=[[United States Postal Service|USPS]] |year=2018 |access-date=13 February 2018 }}</ref>

=== Chinese sizes ===

{| class="wikitable sortable"
|+ Chinese envelope sizes<ref name="pwg">[http://ftp.pwg.org/pub/pwg/candidates/cs-pwgmsn20-20130328-5101.1.pdf PWG 5101.1]</ref>
!colspan=2| Format !! Dimensions (mm) !! Dimensions (in) !! {{abbr|AR|Aspect ratio}} !! Suitable content format
|-
! PRC1 !! Chinese #1 Envelope
| {{size|102|165|ar=yes}} || 
|-
! PRC2 !! Chinese #2 Envelope 
| {{size|102|176|ar=yes}} <!--B6: 125|176--> || 
|-
! PRC3, ISO B6 !! Chinese #3 Envelope
| {{size|125|176|ar=yes}} || C6
|-
! PRC4 !! Chinese #4 Envelope
| {{size|110|208|ar=yes}} || 
|-
! PRC6 !! Chinese #6 Envelope
| {{size|120|320|ar=yes}} || A4 folded once ({{resx|105 mm|297 mm}})
|-
! PRC7 !! Chinese #7 Envelope
| {{size|160|230|ar=yes}} || A5 (rounded ISO C5)
|-
! PRC8 !! Chinese #8 Envelope
| {{size|120|309|ar=yes}} || A4 folded once ({{resx|105 mm|297 mm}})
|-
! PRC10, ISO C3 !! Chinese #10 Envelope
| {{size|324|458|ar=yes}} || A3
|}

=== Japanese sizes ===
Japanese traditional rectangular (角形, ''kakugata'', K) and long (長形, ''nagagata'', N) envelopes open on the short side, while Western-style (洋形, ''yōgata'', Y) envelopes open on the long side.
<!-- ISO C4 is called ''Kaku Koku-sai A4''.-->
The Japanese standard JIS S 5502<ref name="jiss5502">[https://webdesk.jsa.or.jp/books/W11M0090/index/?bunsyo_id=JIS+S+5502%3A2010 JIS S 5502:2010 ''Envelopes'', translated]</ref> was first published in 1964. Some traditional sizes were not kept and some sizes have been removed until its latest edition in 2014, leaving behind gaps in the numeric sequence of designations.

{| class="wikitable sortable"
|+ Japanese envelopes<ref name="pwg"/>
!colspan=2| Format !! Standard !! Dimensions (mm) !! Dimensions (in) !! {{abbr|AR|Aspect ratio}} !! Suitable content format
|-
! Kaku A3 || <!--PWG?-->
| {{no|informal}}
| {{size|320|440|ar=yes}} || A3
|-
! Kaku 0<!--PWG?--> !! K0
| {{yes|not in PWG}}
| {{size|287|382|ar=yes}} || B4
|-
! Kaku 1 !! K1
| {{no|in PWG}}
| {{size|270|382|ar=yes}} || B4
|-
! Kaku 2 !! K2
| {{yes}}
| {{size|240|332|ar=yes}} || A4
|-
! Kaku 20 !! K20
| {{yes|ISO C4}}
| {{size|229|324|ar=yes}} || A4
|-
! Kaku 3 !! K3
| {{yes}}
| {{size|216|277|ar=yes}} || B5
|-
! Kaku 4 !! K4
| {{yes}}
| {{size|197|267|ar=yes}} || B5
|-
! Kaku 5 !! K5
| {{yes}}
| {{size|190|240|ar=yes}} || A5
|-
! Kaku 6<!--no alias in PWG 5101.1--> !! K6
| {{yes|ISO C5}}
| {{size|162|229|ar=yes}} || A5
|-
! Kaku 7 !! K7
| {{yes}}
| {{size|142|205|ar=yes}} || B6
|-
! Kaku 8 !! K8
| {{yes}}
| {{size|119|197|ar=yes}} || salaries, wages
|-
! Chou 1<!--PWG?--> !! N1
| {{no|deprecated}}
| {{size|142|332|ar=yes}} || A4 folded in half lengthwise
|-
!rowspan=2| Chou 2 !! N2
| {{yes|not in PWG}}
| {{size|119|277|ar=yes}}<!--PWG?--> || B5 folded in half lengthwise
|-
!
| {{no|in PWG}}
| {{size|111.1|146|ar=yes}} <!--PWG!--> || 
|-
! Chou 3 !! N3
| {{yes}}
| {{size|120|235|ar=yes}} || A4 folded in thirds
|-
! Chou 30<!--PWG?--> !! N30
| {{no|deprecated}}
| {{size|92|235|ar=yes}} || A4 folded in fourths
|-
! Chou 4 !! N4
| {{yes}}
| {{size|90|205|ar=yes}} || JIS B5 folded in fourths
|-
! Chou 40 !! N40
| {{yes}}
| {{size|90|225|ar=yes}} || A4 folded in fourths
|-
!  !! N6
| {{yes|DL}}
| {{size|110|220|ar=yes}} || A4 folded in thirds
|-
! You 0, You 8 !! Y0
| {{no|deprecated}}
| {{size|136|197|ar=yes}} || ''kyabine'' (cabinet) size photos ({{resx|120 mm|165 mm}})<!--, You 1-->
|-
!rowspan=2| You 1 !! Y1
| {{yes|not in PWG}}
| {{size|120|176|ar=yes}} <!--ISO B6: 125|176 --> ||rowspan=2| C6, You 2<!--; B5 folded in quarters-->
|-
!
| {{no}}
| {{size|118|173|ar=yes}}
|-
! You 2 !! Y2
| {{yes|ISO C6}}
| {{size|114|162|ar=yes}} || A6 ({{resx|105 mm|148 mm}}), Hagaki
|-
! You 3 !! Y3
| {{no|deprecated}}
| {{size|98|148|ar=yes}}  || JIS B7 ({{resx|91 mm|128 mm}})
|-
! You 4 (Chou 31) !! Y4
| {{yes}}
| {{size|105|235|ar=yes}} || A4 folded in thirds ({{resx|99 mm|210 mm}}), You 5
|-
! You 5 !! Y5
| {{no|deprecated}}
| {{size|95|217|ar=yes}}  || A4 folded in fourths ({{resx|74 mm|210 mm}})
|-
! You 6 !! Y6
| {{yes}}
| {{size|98|190|ar=yes}}  || <!--JIS B5 folded in thirds, You 7-->
|-
! You 7 !! Y7
| {{no|deprecated}}
| {{size|92|165|ar=yes}}  || JIS B7
|}