US envelope sizes
| Size | Inches | Mm |
|---|---|---|
| #6 3/4 | 3.625 x 6.5 | 92 x 165 |
| #9 | 3.875 x 8.875 | 98 x 225 |
| #10 | 4.125 x 9.5 | 105 x 241 |
| A2 | 4.375 x 5.75 | 111 x 146 |
| A6 | 4.75 x 6.5 | 121 x 165 |
| A7 | 5.25 x 7.25 | 133 x 184 |
International (ISO 269)
| Size | Mm | Fits |
|---|---|---|
| DL | 110 x 220 | A4 folded in thirds |
| C6 | 114 x 162 | A6 flat |
| C5 | 162 x 229 | A5 flat, A4 folded in half |
| C4 | 229 x 324 | A4 flat |
See the paper size chart for sheet sizes.
Frequently asked questions
What fits in a #10 envelope?
A letter-size page folded in thirds.
What is DL?
110 x 220 mm.