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International paper sizes ISO and JIS standard

Trim sizes in mm. Width x height.

ISO & JIS A Sizes ISO/DIN B Sizes JIS B Sizes ISO C Sizes
4A 1682 x 2378 4B 2000 x 2828 (postcards, folders,
envelopes for
ISO A sizes)
2A 1189 x 1682 2B 1414 x 2000
A0 841 x 1189 B0 1000 x 1414 B0 1030 x 1456 C0 917 x 1297
A1 594 x 841 B1 707 x 1000 B1 728 x 1030 C1 648 x 917
A2 420 x 594 B2 500 x 707 B2 515 x 728 C2 458 x 648
A3 297 x 420 B3 353 x 500 B3 364 x 515 C3 324 x 458
A4 210 x 297 B4 250 x 353 B4 257 x 364 C4 229 x 324
A5 148 x 210 B5 176 x 250 B5 182 x 257 C5 162 x 229
A6 105 x 148 B6 125 x 176 B6 128 x 182 C6 114 x 162
A7 74 x 105 B7 88 x 125 B7 91 x 128 C7 81 x 114
A8 52 x 74 B8 62 x 88 B8 64 x 91 C8 57 x 81
A9 37 x 52 B9 44 x 62 B9 45 x 64 C9 40 x 57
A10 26 x 37 B10 31 x 44 B10 32 x 45 C10 28 x 40

Japanese Envelope sizes

The JIS classifies envelopes in three categories: Choukei (N) (Long), with the opening/flap on the envelope's short dimension, in accordance with traditional practice; Kakukei (K) (Rectangular), with the opening/flap on the short dimension; and Youkei (Y) (Western-style), with the opening/flap on the long dimension. Most Japanese envelope sizes are metricated traditional sizes; Width precedes height; Metric measurements are the finished envelope size; Inch measurements are approximate (calculated at 25.4 mm = 1 inch and rounded off). N.B. Sizes identified as nonstandard do not conform to Universal Postal Union requirements for correspondence envelopes.

JISNameMMInchesUsage and Comments
N1142 x 3325 9/16 x 13 1/16Accepts A4 folded in half lengthwise;
Nonstandard
YesN2119 x 2774 11/16 x 10 7/8Accepts B5 folded in half lengthwise;
Nonstandard
YesN3120 x 2354 3/4 x 9 1/4Accepts A4 folded in thirds; Very
common
N31105 x 2354 1/8 x 9 1/4Accepts A4 folded in thirds
N3092 x 2353 5/8 x 9 1/4Accepts A4 folded in fourths (twice in
the same direction)
N4090 x 2253 9/16 x 8 7/8Accepts A4 folded in fourths (twice in
the same direction)
YesN490 x 2053 9/16 x 8 1/16Accepts JIS B5 folded in fourths (twice
in the same direction); Very common
K A3320 x 44012 5/8 x 17 5/16Accepts A3 flat, A2 folded in half;
Nonstandard
K0287 x 38211 5/16 x 15 1/16Accepts B4 flat, B3 folded in half;
Nonstandard
K1270 x 38210 5/8 x 15 1/16Accepts B4 flat, B3 folded in half;
Nonstandard
YesK2240 x 3329 7/16 x 13 1/16Accepts A4 flat, A3 folded in half;
Nonstandard
K Koku-
sai A4
229 x 3249 x 12 3/4Accepts A4 flat, A3 folded in half; Same
size as ISO C4; Nonstandard
YesK3216 x 2778 1/2 x 10 7/8Accepts B5 flat, B4 folded in half;
Nonstandard
YesK4197 x 2677 3/4 x 10 1/2Accepts B5 flat, B4 folded in half;
Nonstandard
YesK5190 x 2407 1/2 x 9 7/16Accepts A5 flat, A4 folded in half;
Nonstandard
YesK6162 x 2296 3/8 x 9Accepts A5 flat, A4 folded in half; Same
size as ISO C5; Nonstandard
YesK7142 x 2055 9/16 x 8 1/16Accepts B6 flat, B5 folded in half;
Nonstandard
YesK8119 x 1974 11/16 x 7 3/4Pay envelope (for salaries, wages);
Common for direct mail
YesY0* or
Furusu 10
235 x 1209 1/4 x 4 3/4Accepts A4 folded in thirds; Same size
as Naga 3 but has opening/flap on the
long dimension (Western-style)
Y0*197 x 1367 3/4 x 5 3/8For kyabine* (cabinet) size photos
(165 mm x 120 mm); Nonstandard
Y1**176 x 1207 x 4 3/4Accepts B5 folded in quarters
Y1**173 x 1186 13/16 x 4 5/8Accepts B5 folded in quarters
YesY2162 x 1146 3/8 x 4 1/2Accepts A5 folded in half, A4 folded in
quarters; Same size as ISO C6
YesY3148 x 985 13/16 x 3 7/8Accepts B6 folded in half
YesY4235 x 1059 1/4 x 4 1/8Accepts A4 folded in thirds
YesY5217 x 958 9/16 x 3 3/4Accepts A4 folded in fourths (twice in
the same direction)
YesY6190 x 987 1/2 x 3 7/8Accepts B5 folded in thirds
YesY7165 x 926 1/2 x 3 5/8Accepts A4 folded in quarters, B4
folded in quarters

* Because two different sizes are called Y0, the JIS Y0 is normally called Furusu 10;
Furusu ("fools") derives from "foolscap"; Kyabine is a metricated traditional Japanese size.

** Two slightly different sizes are sold as You 1; the smaller size (173 mm x 118 mm) is the paper-industry standard size.