US Envelope Paper Sizes List
| Format | Width × Height(mm) | Width × Height (inches) |
|---|
| 6¼ | 152 × 89 | 6.0 × 3.5 |
| 6¾ | 165 × 92 | 6.5 × 3.6 |
| 7 | 172 × 95 | 6.8 × 3.7 |
| 7¾ Monarch | 191 × 98 | 7.5 × 3.9 |
| 8⅝ | 219 × 92 | 8.6 × 3.6 |
| 9 | 225 × 98 | 8.9 × 3.9 |
| 10 | 241 × 104 | 9.5 × 4.1 |
| 11 | 264 × 114 | 10.4 × 4.5 |
| 12 | 279 × 121 | 11.0 × 4.8 |
| 14 | 292 × 127 | 11.5 × 5.0 |
| 16 | 305 × 152 | 12.0 × 6.0 |
| A1 | 92 × 130 | 3.6 × 5.1 |
| A2 Lady Grey | 146 × 111 | 5.7 × 4.4 |
| A4 | 159 × 108 | 6.3 × 4.3 |
| A6 Thompson's Standard | 165 × 121 | 6.5 × 4.8 |
| A7 Besselheim | 184 × 133 | 7.2 × 5.2 |
| A8 Carr's | 206 × 140 | 8.1 × 5.5 |
| A9 Diplomat | 222 × 146 | 8.7 × 5.7 |
| A10 Willow | 241 × 152 | 9.5 × 6.0 |
| A Long | 225 × 98 | 8.9 × 3.9 |
| 1 | 229 × 152 | 9.0 × 6.0 |
| 1¾ | 241 × 152 | 9.5 × 6.0 |
| 3 | 254 × 178 | 10.0 × 7.0 |
| 6 | 267 × 191 | 10.5 × 7.5 |
| 8 | 286 × 210 | 11.3 × 8.3 |
| 9¾ | 286 × 222 | 11.3 × 8.7 |
| 10½ | 305 × 229 | 12.0 × 9.0 |
| 12½ | 318 × 241 | 12.5 × 9.5 |
| 13½ | 330 × 254 | 13.0 × 10.0 |
| 14½ | 368 × 292 | 14.5 × 11.5 |
| 15 | 381 × 254 | 15.0 × 10.0 |
| 15½ | 394 × 305 | 15.5 × 12.0 |