The international paper was developed in 1922 by a German engineer, Dr. Walter Porstmann.
He determined that the ratio between the length and the width of the base sheet is equal to the square root of two.
√2 the ratio is simply a consequence of a requirement to keep the aspect (conservation of the ratio between the length and width).
Passing from one format sheet format Ax Ax + 1 Ax by folding the sheet in height.
This standard of paper sizes is used in all countries of the world except North America (USA and Canada).
Despite the fact that Mexico, Colombia and the Philippines have signed the ISO 216, they still use the paper "letter".
A0: 46.8 x 33.1 inches
A0: 1189 x 841 mm - x 118.9 x 84.1 cm
A3: 16.5 x 11.7 inches
A3: 420 x 297 mm - 42 x 29.7 cm
A6: 5.8 x 4.1 inches
A6: 148 x 105 mm - 14.8 x 10.5 cm
A9: 2 x 1.5 inches
A9: 37 x 52 mm - 3.7 x 5.2 cm
A1: 33.1 x 23.4 inches
A1: 841 x 594 mm - 84.1 x 59.4 cm
A4: 11.7 x 8.3 inches
A4: 297 x 210 mm - 29.7 x 21 cm
A7: 4.1 x 2.9 inches
A7: 105 x 74 mm - 10.5 x 7.4 cm
A10: 1.6 x 1 inches
A10: 37 x 26 mm - 3.7 x 2.6 cm
A2: 23.4 x 16.5 inches
A2: 594 x 420 mm - 59.4 x 42 cm
A6: 8.3 x 5.8 inches
A5: 210 x 148 mm - 21 x 14.8 mm
A10: 2.9 x 2 inches
A8: 74 x 52 mm - 7.4 x 5.2 cm
A0 is the basic format of printing paper sizes used mainly in Europe and in the world.
The number indicating the number of times that the base sheet (A0) has been divided into two.
Some information on paper sizes
- Note that the width of one becomes the length of the next.
- This format is standardized DIN (Deutsche Industrie Normen)
Correspondence table of A0, A1, A2, A3, A4, A5, A6, A7, A8, A9 and A10