ISO 216 (International Organization for Standardization) is the international standard for paper sizes.
It’s used around the globe except in North America and parts of Latin America. This paper standard, like ANSI and ARCH paper standards, are used to classify paper for various uses in printing and graphic reproduction.
All ISO 216 papers have an aspect ratio based on the square root of 2, which is 1.4142. The primary basis size, A0, has a 1 square meter of area (and of course, the aspect ratio 1.4142.)
The B series of paper sizes was created to provide a series of larger paper sizes than that of the A series.
The ISO paper charts below show how each size in the series relates to the other.
ISO A Sizes of Paper
A0
841 mm x 1,189 mm
(33.11 in. x 46.81 in.)
A1
594 mm x 841 mm
(23.39 in. x 33.11 in.)
A2
420 mm x 594 mm
(16.54 in. x 23.39 in.)
A3
297 mm x 420 mm
(11.69 in. x 16.54 in.)
A4
210 mm x 297 mm
(8.27 in. x 11.69 in.)
A5
148 mm x 210 mm
(5.83 in. x 8.27 in.)
A6
105 mm x 148 mm
(4.13 in. x 5.83 in.)
A7
74 mm x 105 mm
(2.91 in. x 4.13 in.)
ISO A Series Paper Chart
ISO B Sizes of Paper
B0
1,028 mm x 1,456 mm
(40.48 in. x 57.32 in.)
B1
707 mm x 1,000 mm
(28.66 in. x 40.48 in.)
B2
514 mm x 728 mm
(20.24 in. x 28.66 in.)
B3
364 mm x 514 mm
(14.33 in. x 20.24 in.)
B4
257 mm x 364 mm
(10.12 in. x 14.33 in.)
B5
182 mm x 257 mm
(7.17 in. x 10.12 in.)
B6
128 mm x 182 mm
(5.04 in. x 7.17 in.)
ISO B Series Paper Chart
