International paper sizes
International paper sizes International paper sizes are based upon a rectangle of paper with an area of one square metre, the sides of which are in the proportion 1:√2. This geometrical relationship is used so that any lengthways halving of the original rectangle of paper produces another rectangle of paper with the same geometric relationship. For example, the A series is shown here.
There are three series of international paper size; A, B, and C. A is the most common series, with A4 being the favoured size for business correspondence. The B series is often used for posters, wall charts, other large items and where circumstances dictate a size of paper intermediate between any two adjacent sizes of the A series. The C series is used mainly when it is necessary to fit an envelope inside another envelope. The range and sizes of the three series are as follows:
| A series (mm) | |
| A0 | 841 × 1189 |
| A1 | 594 × 841 |
| A2 | 420 × 594 |
| A3 | 297 × 420 |
| A4 | 210 × 297 |
| A5 | 148 × 210 |
| A6 | 105 × 148 |
| A7 | 74 × 105 |
| A8 | 52 × 74 |
| A9 | 37 × 52 |
| A10 | 26 × 37 |
| B series (mm) | |
| B0 | 1000 × 1414 |
| B1 | 707 × 1000 |
| B2 | 500 × 707 |
| B3 | 353 × 500 |
| B4 | 250 × 353 |
| B5 | 176 × 250 |
| B6 | 125 × 176 |
| B7 | 88 × 125 |
| B8 | 62 × 88 |
| B9 | 44 × 62 |
| B10 | 31 × 44 |
| C series (mm) | |
| C4 | 324 × 229 |
| C5 | 229 × 162 |
| C6 | 162 × 114 |
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