US Envelopes
Commercial and catalog envelope formats used in the US.
Catalog 10 x 13
254 x 330.2 mm
No. 6 3/4 Envelope
92.1 x 165.1 mm
Catalog 10 x 13
Catalog 9 x 12
No. 10 Envelope
No. 9 Envelope
No. 6 3/4 Envelope
US Envelopes Size Diagram
Catalog 10 x 1310.00 in x 13.00 in
Catalog 9 x 129.00 in x 12.00 in
No. 10 Envelope4.13 in x 9.50 in
No. 9 Envelope3.87 in x 8.87 in
No. 6 3/4 Envelope3.63 in x 6.50 in
US Envelopes Reference Table
| Name | Width (mm) | Height (mm) | Width (cm) | Height (cm) | Width (in) | Height (in) |
|---|---|---|---|---|---|---|
| Catalog 10 x 13 | 254 | 330.2 | 25.40 | 33.02 | 10.00 | 13.00 |
| Catalog 9 x 12 | 228.6 | 304.8 | 22.86 | 30.48 | 9.00 | 12.00 |
| No. 10 Envelope | 104.8 | 241.3 | 10.48 | 24.13 | 4.13 | 9.50 |
| No. 9 Envelope | 98.4 | 225.4 | 9.84 | 22.54 | 3.87 | 8.87 |
| No. 6 3/4 Envelope | 92.1 | 165.1 | 9.21 | 16.51 | 3.63 | 6.50 |
The Story ofUS Envelopes
US envelope culture is deeply tied to numbered commercial formats. No. 10 became the canonical business envelope because it balances mailing efficiency with everyday letter folding conventions.
Catalog envelopes, by contrast, support flat document handling and larger collateral kits. Together they form a practical toolkit for billing, marketing, and office correspondence.