The international paper size standard, ISO 216, is based on the German DIN 476 standard for paper sizes. Using the metric system, the base format is a sheet of paper measuring 1 m² in area (A0 paper size). Successive paper sizes in the series A1, A2, A3, etc., are defined by halving the preceding paper size parallel to its shorter side. The most frequently used paper size is A4 (210 × 297 mm).
| Format | A series | B series | C series | |||
|---|---|---|---|---|---|---|
| Size | mm × mm | in × in | mm × mm | in × in | mm × mm | in × in |
| -0 | 841 × 1189 | 33.1 × 46.8 | 1000 × 1414 | 39.4 × 55.7 | 917 × 1297 | 36.1 × 51.1 |
| -1 | 594 × 841 | 23.4 × 33.1 | 707 × 1000 | 27.8 × 39.4 | 648 × 917 | 25.5 × 36.1 |
| -2 | 420 × 594 | 16.5 × 23.4 | 500 × 707 | 19.7 × 27.8 | 458 × 648 | 18.0 × 25.5 |
| -3 | 297 × 420 | 11.7 × 16.5 | 353 × 500 | 13.9 × 19.7 | 324 × 458 | 12.8 × 18.0 |
| -4 | 210 × 297 | 8.3 × 11.7 | 250 × 353 | 9.8 × 13.9 | 229 × 324 | 9.0 × 12.8 |
| -5 | 148 × 210 | 5.8 × 8.3 | 176 × 250 | 6.9 × 9.8 | 162 × 229 | 6.4 × 9.0 |
| -6 | 105 × 148 | 4.1 × 5.8 | 125 × 176 | 4.9 × 6.9 | 114 × 162 | 4.5 × 6.4 |
| -7 | 74 × 105 | 2.9 × 4.1 | 88 × 125 | 3.5 × 4.9 | 81 × 114 | 3.2 × 4.5 |
| -8 | 52 × 74 | 2.0 × 2.9 | 62 × 88 | 2.4 × 3.5 | 57 × 81 | 2.2 × 3.2 |
| -9 | 37 × 52 | 1.5 × 2.0 | 44 × 62 | 1.7 × 2.4 | 40 × 57 | 1.6 × 2.2 |
| -10 | 26 × 37 | 1.0 × 1.5 | 31 × 44 | 1.2 × 1.7 | 28 × 40 | 1.1 × 1.6 |
Source : Wikipedia
