There are dozens of sizes of envelopes available.
The designations such as “A2” do not correspond to ISO paper sizes. (Often, North American paper jobbers and printers will insert a hyphen to distinguish from ISO sizes, thus: A-2.)
US Envelope Paper Sizes
| Format | Width × Height (in) | Width × Height (mm) |
|---|---|---|
| 6¼ | 6 × 3.5 in | 152 × 89 mm |
| 6¾ | 6.5 × 3.6 in | 165 × 92 mm |
| 7 | 6.8 × 3.7 in | 172 × 95 mm |
| 7¾ Monarch | 7.5 × 3.9 in | 191 × 98 mm |
| 8⅝ | 8.6 × 3.6 in | 219 × 92 mm |
| 9 | 8.9 × 3.9 in | 225 × 98 mm |
| 10 | 9.5 × 4.1 in | 241 × 104 mm |
| 11 | 10.4 × 4.5 in | 264 × 114 mm |
| 12 | 11 × 4.8 in | 279 × 121 mm |
| 14 | 11.5 × 5 in | 292 × 127 mm |
| 16 | 12 × 6 in | 305 × 152 mm |
| A1 | 3.6 × 5.1 in | 92 × 130 mm |
| A2 Lady Grey | 5.7 × 4.4 in | 146 × 111 mm |
| A4 | 6.3 × 4.3 in | 159 × 108 mm |
| A6 Thompson’s Standard | 6.5 × 4.8 in | 165 × 121 mm |
| A7 Besselheim | 7.2 × 5.2 in | 184 × 133 mm |
| A8 Carr’s | 8.1 × 5.5 in | 206 × 140 mm |
| A9 Diplomat | 8.7 × 5.7 in | 222 × 146 mm |
| A10 Willow | 9.5 × 6 in | 241 × 152 mm |
| A Long | 8.9 × 3.9 in | 225 × 98 mm |
| 1 | 9 × 6 in | 229 × 152 mm |
| 1¾ | 9.5 × 6 in | 241 × 152 mm |
| 3 | 10 × 7 in | 254 × 178 mm |
| 6 | 10.5 × 7.5 in | 267 × 191 mm |
| 8 | 11.3 × 8.3 in | 286 × 210 mm |
| 9¾ | 11.3 × 8.7 in | 286 × 222 mm |
| 10½ | 12 × 9 in | 305 × 229 mm |
| 12½ | 12.5 × 9.5 in | 318 × 241 mm |
| 13½ | 13 × 10 in | 330 × 254 mm |
| 14½ | 14.5 × 11.5 in | 368 × 292 mm |
| 15 | 15 × 10 in | 381 × 254 mm |
| 15½ | 15.5 × 12 in | 394 × 305 mm |
The No. 10 envelope is the standard business envelope size in the United States.
Envelopes accepted by the U.S. Postal Service for mailing at the price of a letter must be:
- Rectangular
- At least 3 1⁄2 inches high × 5 inches long × 0.007 inch thick.
- No more than 6 1⁄8 inches high × 11 1⁄2 inches long × 1⁄4 inch thick.
- Letters that have a length-to-height aspect ratio of less than 1.3 or more than 2.5 are classified as “non-machinable” by the USPS and may cost more to mail.
| A series | B series | C series | US sizes | US Envelope |
| International Envelope | Photography Paper | Canadian | Japanese | Books |
| Newspaper | Chinese | Billboard | Imperial | Colombian |
| French | Raw | Transitional |
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