Dimensions
International Envelope Paper Sizes
More Information
Defined by ISO 269, this standard defines the size of envelopes. It closely follows the paper standard ISO 216 for paper sizes. For example, a sheet of A4 paper, folded three times, will fit snugly into a DL envelope. In addition, an A4 piece of paper wil lfit snugly into a C4 envelope.
This standard is most commonly used in offices worldwide.
| Format | Width × Height (mm) | Width × Height (cm) | Width × Height (in) |
|---|---|---|---|
| DL | 110 × 220 mm | 11 × 22 cm | 4.3 × 8.7 in |
| B4 | 250 × 353 mm | 25 × 35.3 cm | 9.8 × 13.9 in |
| B5 | 176 × 250 mm | 17.6 × 25 cm | 6.9 × 9.8 in |
| B6 | 125 × 176 mm | 12.5 × 17.6 cm | 4.9 × 6.9 in |
| C3 | 324 × 458 mm | 32.4 × 45.8 cm | 12.8 × 18 in |
| C4 | 229 × 324 mm | 22.9 × 32.4 cm | 9 × 12.8 in |
| C5 | 162 × 229 mm | 16.2 × 22.9 cm | 6.4 × 9 in |
| C6/C5 | 114 × 229 mm | 11.4 × 22.9 cm | 4.5 × 9 in |
| C6 | 114 × 162 mm | 11.4 × 16.2 cm | 4.5 × 6.4 in |
| C7/C6 | 81 × 162 mm | 8.1 × 16.2 cm | 3.2 × 6.4 in |
| C7 | 81 × 114 mm | 8.1 × 11.4 cm | 3.2 × 4.5 in |
| E4 | 220 × 312 mm | 22 × 31.2 cm | 8.7 × 12.3 in |