'A' Paper Sizes
ISO paper sizes (plus rounded inch values)
| Format | A series | |
|---|---|---|
| Size | mm × mm | in × in |
| 0 | 841 × 1189 | 33.1 × 46.8 |
| 1 | 594 × 841 | 23.4 × 33.1 |
| 2 | 420 × 594 | 16.5 × 23.4 |
| 3 | 297 × 420 | 11.7 × 16.5 |
| 4 | 210 × 297 | 8.3 × 11.7 |
| 5 | 148.5 × 210 | 5.8 × 8.3 |
| 6 | 105 × 148.5 | 4.1 × 5.8 |
| 7 | 74 × 105 | 2.9 × 4.1 |
| 8 | 52 × 74 | 2.0 × 2.9 |
| 9 | 37 × 52 | 1.5 × 2.0 |
| 10 | 26 × 37 | 1.0 × 1.5 |
It is only the U.S. and Canada that have not adopted the ISO paper system.
The most common paper sizing system used accross the World is the ISO standard. The largest (standard) size is A0, which has an area of 1m². ISO paper sizes are unique in that the aspect ratio is the same for A1 as for A0 (as it is for A2, A3, etc). This particular measurement system was chosen to allow folding of one standard size into another, which cannot be accomplished with traditional paper sizes.
Brochures are typically made by using material at the next size up i.e. material at A3 is folded to make A4 brochures. Similarly, material at A4 is folded to make A5 brochures.
ISO papers sizes also allows scaling without loss of image from one size to another. Thus an A4 page can be enlarged to A3 and retain the exact proportions of the original document. This scalability also means that less paper (and hence money) is wasted.
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