C Envelope Paper Sizes List
| Format | Width × Height(mm) | Width × Height (inches) |
|---|---|---|
| C0 | 917 × 1297 | 36.1 × 51.1 |
| C1 | 648 × 917 | 25.5 × 36.1 |
| C2 | 458 × 648 | 18.0 × 25.5 |
| C3 | 324 × 458 | 12.8 × 18.0 |
| C4 | 229 × 324 | 9.0 × 12.8 |
| C5 | 162 × 229 | 6.4 × 9.0 |
| C6 | 114 × 162 | 4.5 × 6.4 |
| C7 | 81 × 114 | 3.2 × 4.5 |
| C8 | 57 × 81 | 2.2 × 3.2 |
| C9 | 40 × 57 | 1.6 × 2.2 |
| C10 | 28 × 40 | 1.1 × 1.6 |
