Printernational

ISO Paper sizes

In the ISO paper size system, the height-to-width ratio of all pages is the square root of two (1.4142 : 1). In other words, the width and the height of a page relate to each other like the side and the diagonal of a square. This aspect ratio is especially convenient for a paper size. If you put two such pages next to each other, or equivalently cut one parallel to its shorter side into two equal pieces, then the resulting page will have again the same width/height ratio.

The ISO paper sizes are based on the metric system. The square-root-of-two ratio does not permit both the height and width of the pages to be nicely rounded metric lengths. Therefore, the area of the pages has been defined to have round metric values. As paper is usually specified in g/m≤, this simplifies calculation of the mass of a document if the format and number of pages are known.

ISO Sizes A series

ISO Code Size in millimeters Size in inches Size in Points
4A0 1682 mm x 2378 mm 66.22 in x 93.62 in 4768 pt x 6741 pt
2A0 1189 mm x 1682 mm 46.81 in x 66.22 in 3370 pt x 4768 pt
A0 841 mm x 1189 mm 33 in x 46.81 in 2384 pt x 3370 pt
A1 594 mm x 841 mm 23.39 in x 33 in 1684 pt x 2384 pt
A2 420 mm x 594 mm 16.54 in x 23.36 in 1191 pt x 1684 pt
A3 297 mm x 420 mm 11.69 in x 16.54 in 842 pt x 1191 pt
A4 210 mm 297 mm 8.27 in x 11.69 in 595 pt x 842 pt
A5 148 mm x 210 mm 5.83 in x 8.27 in 420 pt x 595 pt
A6 105 mm x 148 mm 4.13 in x 5.83 in 298 pt x 420 pt
A7 74 mm x 105 mm 2.91 in x 4.13 in 210 pt x 298 pt
A8 52 mm x 74 mm 2.05 in x 2.91 in 147 pt x 210 pt
A9 37 mm x 52 mm 1.46 in x 2.05 in 105 pt x 147 pt
A10 26 mm x 37 mm 1.02 in x 1.46 in 74 pt x 105 pt

The B series formats are geometric means between the A series format with the same number and the A series format with one lower number. For example, B1 is a geometric mean between A1 and A0. The sides of B0 are 1 m to v2 m.

ISO Sizes B series

ISO Code Size in millimeters Size in inches Size in Points
B0 1000 mm x 1414 mm 33.37 in x 55.67 in 2836 pt x 4008 pt
B1 707 mm x 1000 mm 27.84 in x 39.37 in 2004 pt x 2835 pt
B2 500 mm x 707 mm 19.69 in x 27.84 in 1417 pt x 2004 pt
B3 353 mm x 500 mm 13.9 in x 19.69 in 1001 pt x 1417 pt
B4 250 mm x 352 mm 9.84 in x 13.9 in 709 pt x 1001 pt
B5 176 mm x 250 mm 6.93 in x 9.84 in 499 pt x 709 pt
B6 125 mm x 176 mm 4.92 in x 6.93 in 354 pt x 499 pt
B7 88 mm x 125 mm 3.47 in x 4.92 in 249 pt x 354 pt
B8 62 mm x 88 mm 2.44 in x 3.47 in 176 pt x 249 pt
B9 44 mm x 62 mm 1.73 in x 2.44 in 125 pt x 176 pt
B10 31 mm x 44 mm 1.22 in x 1.73 in 88 pt x 125 pt

ISO size variations

The following sizes are all variations on paper sizes in the ISO series. Since these are european standards, the size in inches is aproxiamte.

Name Size in millimeters Size in inches
A2 extra 445 mm x 619 mm 17.51 in x 24.3 in
A3 extra 322 mm x 445 mm 12.67 in x 17.51 in
A3 Super 305 mm x 508 mm 12 in x 20 in
Super A3 305 mm x 487 mm 12 in x 19.17 in
A4 extra 235 mm x 322 mm 9.25 in x 12.67 in
A4 Super 229 mm x 322 mm 9.25 in x 12.67 in
Super A4 227 mm x 356 mm 8.93 in x 14.01 in
A4 Long 210 mm x 348 mm 8.26 in x 13.7 in
A5 extra 173 mm x 235 mm 8.26 in x 9.25 in
SO B5 extra 202 mm x 276 mm 7.95 in x 10.86 in

The current ISO 216 standard was introduced in 1975 and is a direct follow up to the german DIN 476 standard from 1922. The Netherlands have used the DIN/ISO standard since 1925, Belgium since 1924, England (UK) since 1959 and France since 1967. ISO 216 is also called EN 20216 in Europe.

For the ISO C series please refer to our over view of ISO Envelope sizes.


About the author

Damien van Holten Hi there! My name is Damien. I'm a designer & developer. I’ve got a passion for awesome code and I love tea with lots of milk. I’m currently located in lovely Rotterdam, the Netherlands.

Questions, comments or just want to talk? I'm happy to get in touch with you. Don't hesitate to email me or contact me on twitter: @damienvanholten.