Japanese Paper Sizes

The Japanese Industrial Standards organisation (JIS) has defined two paper size series the JIS A, that is the same as ISO 216 A size with minor differences in tolerances. JIS B series paper is not the same as ISO 216 B series paper, with the JIS B sizes having an area of 1.5 times the A paper size rather than the root 2 times the size in ISO 216.

Table of JIS B Paper Sizes From B0 to B10

SizeWidth x Height (mm)Width x Height (in)
B01030 x 1456 mm40.6 x 57.3 in
B1728 x 1030 mm28.7 x 40.6 in
B2515 x 728 mm20.3 x 28.7 in
B3364 x 515 mm14.3 x 20.3 in
B4257 x 364 mm10.1 x 14.3 in
B5182 x 257 mm7.2 x 10.1 in
B6128 x 182 mm5.0 x 7.2 in
B791 x 128 mm3.6 x 5.0 in
B864 x 91 mm2.5 x 3.6 in
B945 x 64 mm1.8 x 2.5 in
B1032 x 45 mm1.3 x 1.8 in

Traditional Paper Sizes

There are a number of older paper sizes still in use by printers in Japan, these include Shirokuban and Kiku sizes.

Shirokuban Sizes

Length x Height (mm) Length x Height (in) Aspect Ratio
264 x 379 mm 10.39 x 14.92 in 1:1.4356
189 x 262 mm 7.44 x 10.31 in 1:1.3862
127 x 188 mm 5.00 x 7.40 in 1:1.4803

The sizes for Shirokuban are not fixed and may vary slightly between producers.

Kiku Sizes

Length x Height (mm) Length x Height (in) Aspect Ratio
227 x 306 mm 8.94 x 12.05 in 1:1.3480
151 x 227 mm 5.94 x 8.94 in 1:1.5033

Other Paper Sizes Found In Japan

There are a number of other paper sizes that are in use in Japan. AB format has the short side of A4 and the long side of B5. B40 size is 80% of the size of B5.

Size Length x Height (mm) Length x Height (in) Aspect Ratio
AB 210 x 257 mm 8.27 x 10.12 in 1:1.2238
B40 103 x 182 mm 4.06 x 7.17 in 1:1.7670
Shikisen 84 x 148 mm 3.31 x 5.83 in 1:1.7619