Paper size series
US envelope sizes: Dimensions Chart
North American envelope sizes. 'Number' envelopes are for business letters; 'A' envelopes are for cards and invitations.
Sizes to scale
| Size | Millimetres | Inches | Pixels @ 300 dpi | Typical use |
|---|---|---|---|---|
| #6¾ envelope | 92.1 x 165.1 mm | 3.63 x 6.5 in | 1,088 x 1,950 | Personal correspondence and remittance. |
| #9 envelope | 98.4 x 225.4 mm | 3.88 x 8.88 in | 1,162 x 2,662 | Reply envelope that fits inside a #10. |
| #10 envelope | 104.8 x 241.3 mm | 4.13 x 9.5 in | 1,238 x 2,850 | The standard US business envelope; holds Letter folded in thirds. |
| #11 envelope | 114.3 x 263.5 mm | 4.5 x 10.38 in | 1,350 x 3,112 | Larger business mailings. |
| #12 envelope | 120.7 x 279.4 mm | 4.75 x 11 in | 1,425 x 3,300 | Thick business mailings. |
| #14 envelope | 127 x 292.1 mm | 5 x 11.5 in | 1,500 x 3,450 | Legal documents folded in thirds. |
| Monarch envelope | 98.4 x 190.5 mm | 3.88 x 7.5 in | 1,162 x 2,250 | Executive / Monarch stationery. |
| A2 envelope | 111.1 x 146.1 mm | 4.38 x 5.75 in | 1,312 x 1,725 | Note cards and response cards (4.25 x 5.5 in). |
| A6 envelope | 120.7 x 165.1 mm | 4.75 x 6.5 in | 1,425 x 1,950 | 4 x 6 in photos and cards. |
| A7 envelope | 133.4 x 184.2 mm | 5.25 x 7.25 in | 1,575 x 2,175 | 5 x 7 in invitations — the most popular invitation size. |
| A9 envelope | 146.1 x 222.3 mm | 5.75 x 8.75 in | 1,725 x 2,625 | Half-letter (5.5 x 8.5 in) cards and brochures. |
| 6 x 9 booklet envelope | 152.4 x 228.6 mm | 6 x 9 in | 1,800 x 2,700 | Booklets, Letter folded once, small catalogues. |
| 9 x 12 catalog envelope | 228.6 x 304.8 mm | 9 x 12 in | 2,700 x 3,600 | Unfolded Letter documents and catalogues. |
| 10 x 13 catalog envelope | 254 x 330.2 mm | 10 x 13 in | 3,000 x 3,900 | Thick catalogues and documents with inserts. |