A8 Envelope (US) paper size
139.7 × 206.375 mm
5.5 × 8.13 inches · 13.97 × 20.64 cm · aspect ratio 1:1.48
A8 Envelope (US) size is 139.7 × 206.375 mm. Those are the A8 Envelope (US) dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What A8 Envelope (US) is for
A8 Envelope (US) is 5½ × 8⅛ inches, or 139.7 × 206.375 mm. A tall announcement envelope for longer invitations and event programmes. The jump from A7 to A8 adds nearly an inch of height, which is what it is for.
A8 Envelope (US) dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 139.7 mm | 206.375 mm |
| Centimetres | 13.97 cm | 20.64 cm |
| Inches | 5.5 in | 8.13 in |
| Points (PostScript) | 396 pt | 585 pt |
A8 Envelope (US) in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. Every resolution, with file sizes and canvas setup →
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 396 × 585 | Screen preview only — far too coarse to print |
| 150 DPI | 825 × 1219 | Draft printing, internal documents |
| 300 DPI | 1650 × 2438 | The standard for commercial print |
| 600 DPI | 3300 × 4875 | Fine detail, line art, archival scanning |
Setting up a print document? Use 300 DPI and add 3 mm of bleed on every edge unless your printer specifies otherwise.
How A8 Envelope (US) relates to the rest of the series
At 139.7 × 206.375 mm (5.5 × 8.13 inches) the aspect ratio is 1:1.477. US envelopes are not a halving series: each size is cut to hold a particular sheet or card, so the numbers step irregularly and nothing scales cleanly to anything else.
Of the standard sheets on this site, the largest that goes in flat is Junior Legal at 127 × 203.2 mm, with a few millimetres to spare on each edge.
Folded, the largest standard sheet it takes is a Letter sheet folded in half and then in three.
About A8 Envelope (US)
5.5 × 8.125 inches. A tall US announcement envelope. Unrelated to ISO A8.
Other US envelope sizes sizes
| Size | Millimetres | Inches |
|---|---|---|
| Envelope No. 10 | 104.775 × 241.3 mm | 4.13 × 9.5 in |
| A7 Envelope (US) | 133.35 × 184.15 mm | 5.25 × 7.25 in |
| A1 Envelope (US) | 92.075 × 130.175 mm | 3.63 × 5.13 in |
| A2 Envelope (US) | 111.125 × 146.05 mm | 4.38 × 5.75 in |
| A6 Envelope (US) | 120.65 × 165.1 mm | 4.75 × 6.5 in |
| A9 Envelope (US) | 146.05 × 222.25 mm | 5.75 × 8.75 in |
| A10 Envelope (US) | 152.4 × 241.3 mm | 6 × 9.5 in |
| Envelope No. 6 3/4 | 92.075 × 165.1 mm | 3.63 × 6.5 in |
| Envelope No. 9 | 98.425 × 225.425 mm | 3.88 × 8.88 in |
| Envelope No. 11 | 114.3 × 263.525 mm | 4.5 × 10.38 in |
| Envelope No. 12 | 120.65 × 279.4 mm | 4.75 × 11 in |
| Envelope No. 14 | 127 × 292.1 mm | 5 × 11.5 in |
Frequently asked questions
What size is A8 Envelope (US) in mm?
139.7 × 206.375 mm.
What size is A8 Envelope (US) in inches?
5.5 × 8.13 inches.
What size is A8 Envelope (US) in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1650 × 2438 pixels; at 72 DPI it is only 396 × 585.