US Envelope Sizes
The most common US envelopes can be categorized as business, booklet, and catalog envelopes. Business envelopes like the #9 and #10 are widely used for direct mail and billing statements. The #10 envelope is very popular, with a typical size of 4.125 x 9.5 inches. Booklet envelopes are open-side and come in sizes like 9 x 12 inches. They are often used for policy mailers. Catalog envelopes are open-end envelopes used for things like insurance information. A common catalog envelope size is 9 x 12 inches. Overall, business envelopes tend to be smaller and used for transactions, booklet envelopes have an open side and fit brochures, and catalog envelopes are open-ended for flat mailings. The numbering system helps identify standard envelope sizes even though the numbers don't correlate to dimensions.
| Title | Metric Dimensions (mm) | Imperial Dimensions (inch) |
|---|---|---|
| #6 Business | 152.4 x 88.9 | 6 x 3.5 |
| #6 3/4 Business | 165.1 x 92.1 | 6.5 x 3.6 |
| #7 Business | 171.4 x 95.3 | 6.8 x 3.8 |
| #8 5/8 Business | 219.1 x 92.1 | 8.6 x 3.6 |
| #9 Business | 225.4 x 98.4 | 8.9 x 3.9 |
| #10 Business | 241.3 x 104.8 | 9.5 x 4.1 |
| #11 Business | 263.5 x 114.3 | 10.4 x 4.5 |
| #12 Business | 279.4 x 120.6 | 11 x 4.8 |
| #14 Business | 292.1 x 127 | 11.5 x 5 |
| 6 Booklet | 225.4 x 146 | 8.9 x 5.8 |
| 6 1/2 Booklet | 228.6 x 152.4 | 9 x 6 |
| 6 5/8 Booklet | 241.3 x 152.4 | 9.5 x 6 |
| 9 Booklet | 292.1 x 222.3 | 11.5 x 8.8 |
| 9 1/2 Booklet | 304.8 x 228.6 | 12 x 9 |
| 10 Booklet | 320.7 x 241.3 | 12.6 x 9.5 |
| 6 x 9 Catalog | 152.4 x 228.6 | 6 x 9 |
| 9 x 12 Catalog | 228.6 x 304.8 | 9 x 12 |
| 10 x 13 Catalog | 254 x 330.2 | 10 x 13 |