Dimensions
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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 will fit 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 |