Envelope Sizes | Envelope Styles
Commercial Envelopes
| Envelope Type | Envelope Size | Enclosure Size |
| 6 1/4 | 3.5" x 6" | 3.25" x 5.75" |
| 6 3/4 | 3.625" x 6.5" | 3.5" x 6.25" |
| 7 | 3.75" x 6.75" | 3.5" x 6.5" |
| Monarch 7 3/4 | 3.875" x 7.5" | 3.75" x 7.25" |
| 8 5/8 | 3.625" x 8.625" | 3.5" x 8.375" |
| 9 | 3.875" x 8.875" | 3.75" x 8.625" |
| 10 | 4.125" x 9.5" | 4" x 9.25" |
| 11 | 4.5" x 10.375" | 4.25" x 10.125" |
| 12 | 4.75" x 11" | 4.5" x 10.75" |
Booklet Envelopes (open side)
| Envelope Type | Envelope Size | Enclosure Size |
| 3 | 4.75" x 6.5" | 4.5" x 6" |
| 5 | 5.5" x 8.125" | 5.25" x 7.625" |
| 6 | 5.75" x 8.875" | 5.5" x 8.375" |
| 6 1/2 | 6" x 9" | 5.75" x 8.5" |
| 6 5/8 | 6" x 9.5" | 5.75" x 9" |
| 6 3/4 | 6.5" x 9.5" | 6.25" x 9" |
| 7 1/2 | 7.5" x 10.5" | 7.25" x 10" |
| 9 | 8.75" x 11.5" | 8.5" x 11" |
| 9 1/2 | 9" x 12" | 8.75" x 11.5" |
| 10 | 9.5" x 12.625" | 9.25" x 12.125" |
| 13 | 10" x 13" | 9.75" x 12.5" |
Catalog Envelopes (open end)
| Envelope Type | Envelope Size | Enclosure Size |
| 1 | 6" x 9" | 5.75" x 8.5" |
| 1 3/4 | 6.5" x 9.5" | 6.25" x 9" |
| 3 | 7" x 10" | 6.75" x 9.5" |
| 6 | 7.5" x 10.5" | 7.25" x 10" |
| 8 | 8.25" x 11.25" | 8" x 10.75" |
| 9 3/4 | 8.75" x 11.25" | 8.5" x 10.75" |
| 10 1/2 | 9" x 12" | 8.75" x 11.5" |
| 12 1/2 | 9.5" x 12.5" | 9.25" x 12" |
| 13 1/2 | 10" x 13" | 9.75" x 12.5" |
| 14 1 /2 | 11.5" x 14.5" | 11.25" x 14" |
| 15 | 10" x 15" | 9.75" x 14.5" |
| 15 1/2 | 12" x 15.5" | 11.75" x 15" |
Announcement Envelopes
| Envelope Type | Envelope Size | Enclosure Size |
| 4 Baronial | 3.625" x 5.125" | 3.5" x 4.875" |
| Astor | 3.625" x 5.625" | 3.5" x 5.375" |
| 5 Baronial | 4.125" x 5.625" | 4" x 5.375" |
| 5 1/2 Baronial | 4.375" x 5.75" | 4.25" x 5.5" |
| 6 Baronial | 4.75" x 6.5" | 4.625" x 6.25" |
| Lee | 5.25" x 7.25" | 5.125" x 7" |
A-Style Envelopes
| Envelope Type | Envelope Size | Enclosure Size |
| A-2 | 4.375" x 5.75" | 4.25" x 5.5" |
| A-6 | 4.75" x 6.5" | 4.5" x 6.25" |
| A-7 | 5.25" x 7.25" | 5.125" x 7" |
| A-8 | 5.5" x 8.125" | 5.375" x 7.875" |
| A-Long | 3.875" x 8.875" | 3.75" x 8.625" |
| A-10 | 6" x 9.5" | 5.875" x 9.25" |
Square Flap Envelopes
| Envelope Type | Envelope Size | Enclosure Size |
| 6 1/4 | 3.5" x 6" | 3.25" x 5.75" |
| 6 3/4 | 3.625" x 6.5" | 3.5" x 6.25" |
| 7 | 3.75" x 6.75" | 3.5" x 6.5" |
| Monarch 7 3/4 | 3.875" x 7.5" | 3.75" x 7.25" |
| 8 5/8 | 3.625" x 8.625" | 3.5" x 8.375" |
| 9 | 3.875" x 8.875" | 3.75" x 8.625" |
| 10 | 4.125" x 9.5" | 4" x 9.25" |
| 11 | 4.5" x 10.375" | 4.25" x 10.125" |
| 12 | 4.75" x 11" | 4.5" x 10.75" |
Square Envelopes
| Envelope Type | Envelope Size | Enclosure Size |
| 6 1/2 | 6.5" x 6.5" | 6.25" x 6.25" |
| 7 | 7" x 7" | 6.75" x 6.75" |
| 7 1/2 | 7.5" x 7.5" | 7.25" x 7.25" |
| 8 | 8" x 8" | 7.75" x 7.75" |
| 8 1/2 | 8.5" x 8.5" | 8.25" x 8.25" |
| 9 | 9" x 9" | 8.75" x 8.75" |
| 9 1/2 | 9.5" x 9.5" | 9.25" x 9.25" |
| 10 | 10" x 10" | 9.75" x 9.75" |
Side Seamed Envelopes
| Envelope Type | Envelope Size | Enclosure Size |
| 6 3/4 | 3.625" x 6.5" | 3.5" x 6.25" |
| 7 3/4 | 3.875" x 7.5" | 3.75" x 7.25" |
| 9 | 3.875" x 8.875" | 3.75" x 8.625" |
| 10 | 4.125" x 9.5" | 4" x 9.25" |