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Paper Sizes
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The international standard: ISO 216
Within the ISO 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, and so forth, are defined by halving the preceding paper size parallel to its shorter side. The most frequently used paper size is A4 (210 × 297 mm). An advantage is that standard A4 sheets made from 80 grams/m² paper weighs 5 grams, allowing one to know the weight - and associated postage rate - by counting the number of sheets used.
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| Size |
mm × mm |
in × in |
| A0 |
841 × 1189 |
33.1 × 46.8 |
| A1 |
594 × 841 |
23.4 × 33.1 |
| A2 |
420 × 594 |
16.5 × 23.4 |
| A3 |
297 × 420 |
11.7 × 16.5 |
| A4 |
210 × 297 |
8.3 × 11.7 |
| A5 |
148 × 210 |
5.8 × 8.3 |
| A6 |
105 × 148 |
4.1 × 5.8 |
| A7 |
74 × 105 |
2.9 × 4.1 |
| A8 |
52 × 74 |
2.0 × 2.9 |
| A9 |
37 × 52 |
1.5 × 2.0 |
| A10 |
26 × 37 |
1.0 × 1.5 |
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