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ISO 216 defines the most common paper size standard in operation in the world today. With the exception of the United States, Canada, Peru, Mexico, Colombia and The Dominican Republic, the ISO 216 is used in every country to specify standard "A" size and "B" size paper, including the most common sized paper in the world, A4.

Alongside ISO 216, there exists two other ISO standards, ISO 217 and ISO 269, that together define related paper sizes. The ISO 269 defines the "C" sized paper series, which is closely related to both "A" and "B" sized paper.

With the exception of some envelope sizes, ISO 216, ISO 217 and ISO 269 share the same aspect ratio of √2:1, within rounding to millimeters. This has the unique property that folding the paper in half will produce the same sized aspect ratio for the two halves of paper. This makes sizing easier to maintain and eases use for developers and paper users.

Format Width x Height (mm) Width x Height (inches)
A0 841 x 1189 mm 33.1 x 46.8 inches
A1 594 x 841 mm 23.4 x 33.1 inches
A2 420 x 594 mm 16.5 x 23.4 inches
A3 297 x 420 mm 11.7 x 16.5 inches
A4 210 x 297 mm 8.3 x 11.7 inches
A5 148 x 210 mm 5.8 x 8.3 inches
A6 105 x 148 mm 4.1 x 5.8 inches
A7 74 x 105 mm 2.9 x 4.1 inches
A8 52 x 74 mm 2 x 2.9 inches
A9 37 x 52 mm 1.5 x 2 inches
A10 26 x 37 mm 1 x 1.5 inches
A11 18 x 26 mm 0.7 x 1 inches
A12 13 x 18 mm 0.5 x 0.7 inches
A13 9 x 13 mm 0.4 x 0.5 inches
2A0 1189 x 1682 mm 46.8 x 66.2 inches
4A0 1682 x 2378 mm 66.2 x 93.6 inches
A0+ 914 x 1292 mm 36 x 50.9 inches
A1+ 609 x 914 mm 24 x 36 inches
A3+ 329 x 483 mm 13 x 19 inches