Japanese Paper Sizes


Our paper size chart below follows the strict guidelines set by  International Standards (ISO) and Japanese Industry Standards (JIS).  

MM (millimeters)  will be used as the trim size with IN (inches) to serve alongside as a guide. Width will also precede before Height (Width x Height) .

Outside of the US, Canada, and parts of Mexico, paper sizes are usually designated as A, B, and C series.

ISO & JIS A Sizes ISO/DIN (German Standard) B Sizes JIS B Sizes ISO C Sizes
Size MMxMM INxIN Size MMxMM INxIN Size MMxMM INxIN Size MMxMM INxIN
4A 1682 x 2378  66.22x 93.622 4B 2000 x 2828  78.74x 111.34 (Postcards, folders, or envelopes for ISO A Sizes)
*Please reference below for more information about JIS standard envelopes
2A 1189 x 1682  46.81x 66.22 2B 1414 x 2000  55.67x78.74
A0 841 × 1189 33.1 × 46.8 B0 1000 × 1414 39.4 × 55.7 B0 1030 × 1456 40.55 × 57.32 C0 917 × 1297 36.1 × 51.1
A1 594 × 841 23.4 × 33.1 B1 707 × 1000 27.8 × 39.4 B1 728 × 1030 28.66 × 40.55 C1 648 × 917 25.5 × 36.1
A2 420 × 594 16.5 × 23.4 B2 500 × 707 19.7 × 27.8 B2 515 × 728 20.28 × 28.66 C2 458 × 648 18.0 × 25.5
A3 297 × 420 11.7 × 16.5 B3 353 × 500 13.9 × 19.7 B3 364 × 515 14.33 × 20.28 C3 324 × 458 12.8 × 18.0
A4 210 × 297 8.27 × 11.7 B4 250 × 353 9.84 × 13.9 B4 257 × 364 10.12 × 14.33 C4 229 × 324 9.02 × 12.8
A5 148 × 210 5.83 × 8.27 B5 176 × 250 6.93 × 9.84 B5 182 × 257 7.17 × 10.12 C5 162 × 229 6.38 × 9.02
A6 105 × 148 4.13 × 5.83 B6 125 × 176 4.92 × 6.93 B6 128 × 182 5.04 × 7.17 C6 114 × 162 4.49 × 6.38
A7 74 × 105 2.91 × 4.13 B7 88 × 125 3.46 × 4.92 B7 91 × 128 3.58 × 5.04 C7 81 × 114 3.19 × 4.49
A8 52 × 74 2.05 × 2.91 B8 62 × 88 2.44 × 3.46 B8 64 × 91 2.52 × 3.58 C8 57 × 81 2.24 × 3.19
A9 37 × 52 1.46 × 2.05 B9 44 × 62 1.73 × 2.44 B9 45 × 64 1.77 × 2.52 C9 40 × 57 1.57 × 2.24
A10 26 × 37 1.02 × 1.46 B10 31 × 44 1.22 × 1.73 B10 32 × 45 1.26 × 1.77 C10 28 × 40 1.10 × 1.57
Examples of Commonly Printed Items:
A0, A1 technical drawings, posters
A1, A2 flip charts
A2, A3 drawings, diagrams, large tables
A4 letters, magazines, forms, catalogs, laser printer and copying machine output
A5 notepads
A6 postcards
B5, A5, B6, A6 books
C4, C5, C6 envelopes for A4 letters: unfolded (C4), folded once (C5), folded twice (C6)
B4, A3 newspapers, supported by most copying machines in addition to A4
B8, A8 playing cards

*Japanese Envelopes

JIS- standard envelopes are classified into 3 categories:

  • 長形 / Choukei (Long) — an envelope with short dimensions at the opening/flap in accordance with traditional practices
  • 角形 / Kakutei (Rectangular) — an opening/flap with short dimensions
  • And  洋形  / Youkei (Western-Style) —an opening/flap with long dimensions

Most Japanese envelopes use the metric system with Width preceding Height (Width x Height).

Inches displayed in the chart below are only an approximation from MM ( 25.44 mm = 1 inch and rounded off).

And N.B. Sizes identified as ‘Nonstandard ‘ do not conform to Universal Postal Union requirements for correspondence envelopes.

JIS Name MM Inches Usage and Comments
Chou 1 142 x 332 5 9/16 x 13 1/16 Accepts A4 folded in half lengthwise; Nonstandard
Yes Chou 2 119 x 277 4 11/16 x 10 7/8 Accepts B5 folded in half lengthwise; Nonstandard
Yes Chou 3 120 x 235 4 3/4 x 9 1/4 Accepts A4 folded in thirds; Very common
Chou 31 105 x 235 4 1/8 x 9 1/4 Accepts A4 folded in thirds
Chou 30 92 x 235 3 5/8 x 9 1/4 Accepts A4 folded in fourths (twice in the same direction)
Chou 40 90 x 225 3 9/16 x 8 7/8 Accepts A4 folded in fourths (twice in the same direction)
Yes Chou 4 90 x 205 3 9/16 x 8 1/16 Accepts JIS B5 folded in fourths (twice in the same direction); Very common
Kaku A3 320 x 440 12 5/8 x 17 5/16 Accepts A3 flat, A2 folded in half; Nonstandard
Kaku 0 287 x 382 11 5/16 x 15 1/16 Accepts B4 flat, B3 folded in half; Nonstandard
Kaku 1 270 x 382 10 5/8 x 15 1/16 Accepts B4 flat, B3 folded in half; Nonstandard
Yes Kaku 2 240 x 332 9 7/16 x 13 1/16 Accepts A4 flat, A3 folded in half; Nonstandard
Kaku Koku- sai A4 229 x 324 9 x 12 3/4 Accepts A4 flat, A3 folded in half; Same size as ISO C4; Nonstandard
Yes Kaku 3 216 x 277 8 1/2 x 10 7/8 Accepts B5 flat, B4 folded in half; Nonstandard
Yes Kaku 4 197 x 267 7 3/4 x 10 1/2 Accepts B5 flat, B4 folded in half; Nonstandard
Yes Kaku 5 190 x 240 7 1/2 x 9 7/16 Accepts A5 flat, A4 folded in half; Nonstandard
Yes Kaku 6 162 x 229 6 3/8 x 9 Accepts A5 flat, A4 folded in half; Same size as ISO C5; Nonstandard
Yes Kaku 7 142 x 205 5 9/16 x 8 1/16 Accepts B6 flat, B5 folded in half; Nonstandard
Yes Kaku 8 119 x 197 4 11/16 x 7 3/4 Pay envelope (for salaries, wages); Common for direct mail
Yes You 0* or Furusu 10 235 x 120 9 1/4 x 4 3/4 Accepts A4 folded in thirds; Same size as Chou 3 but has opening/flap on the long dimension (Western-style)
You 0* 197 x 136 7 3/4 x 5 3/8 For kyabine* (cabinet) size photos (165 mm x 120 mm); Nonstandard
You 1** 176 x 120 7 x 4 3/4 Accepts B5 folded in quarters
You 1** 173 x 118 6 13/16 x 4 5/8 Accepts B5 folded in quarters
Yes You 2 162 x 114 6 3/8 x 4 1/2 Accepts A5 folded in half, A4 folded in quarters; Same size as ISO C6
Yes You 3 148 x 98 5 13/16 x 3 7/8 Accepts B6 folded in half
Yes You 4 235 x 105 9 1/4 x 4 1/8 Accepts A4 folded in thirds
Yes You 5 217 x 95 8 9/16 x 3 3/4 Accepts A4 folded in fourths (twice in the same direction)
Yes You 6 190 x 98 7 1/2 x 3 7/8 Accepts B5 folded in thirds
Yes You 7 165 x 92 6 1/2 x 3 5/8 Accepts A4 folded in quarters, B4 folded in quarters

*Since there are two different sizes called You 0 and JIS You 0. The latter will often be referenced as Furusu 10, which is derived from the word ‘fools’ or ‘foolscap’.

Kyabine is a metricated traditional Japanese size.

** Two different sizes may slightly vary for You 1, but the smaller size (173mm x 118 mm or 6 13/16 inches x 4 5/8 inches) is the standard paper-industry size.

Japanese Postcards

According to the Japan Post Service,  local delivery rates can vary between 52 yen to 104 yen depending on what type of postcard it is. For any deliveries abroad, it can cost about 60 yen for surface mail, and 70 yen for airmail usage.

Type of Postcard Local Rates International Rates
Standard Postcard 52 yen 70 yen for airmail, 60 yen for surface mail
Standard postcard, for inkjet printing 52 yen 70 yen for airmail, 60 yen for surface mail
Standard postcard, Phalaenopsis orchid (52 yen) 52 yen 70 yen for airmail, 60 yen for surface mail
Reply-paid card 104 yen 70 yen for airmail, 60 yen for surface mail

Although, for additional information about postcard size and weight requirements, please refer to Japan Post Services here: http://www.post.japanpost.jp/service/standard/two_size_en.html

If there are any questions in regards to paper sizes or other paper-related inquiries, please don’t hesitate to contact our staff.

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