Envelope sizes
3 envelope sizes, with what each one actually specifies.
| Name | Millimetres | Inches | Notes |
|---|---|---|---|
| DL envelope | 220 × 110 mm | 8.66 × 4.33 | 220 × 110 mm — fits A4 folded into three. |
| C4 envelope | 229 × 324 mm | 9.02 × 12.76 | 229 × 324 mm — holds A4 unfolded. |
| C5 envelope | 162 × 229 mm | 6.38 × 9.02 | 162 × 229 mm — holds A4 folded once, or A5 flat. |
- DL envelope size 220 × 110 mm — fits A4 folded into three.
- C4 envelope size 229 × 324 mm — holds A4 unfolded.
- C5 envelope size 162 × 229 mm — holds A4 folded once, or A5 flat.