A7 Envelope (US) paper size
133.35 × 184.15 mm
5.25 × 7.25 inches · 13.34 × 18.42 cm · aspect ratio 1:1.38
What A7 Envelope (US) is for
The US A7 envelope is 5.25 × 7.25 inches and is the standard for wedding invitations, greeting cards and photo enclosures. It has nothing to do with ISO A7, which is 74 × 105 mm and about a seventh of the area — the shared name is a genuine trap when ordering from an international supplier, so specify the dimensions rather than the letter.
A7 Envelope (US) in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 133.35 mm | 184.15 mm |
| Centimetres | 13.34 cm | 18.42 cm |
| Inches | 5.25 in | 7.25 in |
| Points (PostScript) | 378 pt | 522 pt |
A7 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.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 378 × 522 | Screen preview only — far too coarse to print |
| 150 DPI | 788 × 1088 | Draft printing, internal documents |
| 300 DPI | 1575 × 2175 | The standard for commercial print |
| 600 DPI | 3150 × 4350 | 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 A7 Envelope (US) relates to the rest of the series
About A7 Envelope (US)
5.25 × 7.25 inches, the US invitation envelope. Unrelated to ISO A7.
Other ISO C series sizes
| Size | Millimetres | Inches |
|---|---|---|
| C4 | 229 × 324 mm | 9.02 × 12.76 in |
| C5 | 162 × 229 mm | 6.38 × 9.02 in |
| C6 | 114 × 162 mm | 4.49 × 6.38 in |
| DL | 110 × 220 mm | 4.33 × 8.66 in |
| C3 | 324 × 458 mm | 12.76 × 18.03 in |
| C7 | 81 × 114 mm | 3.19 × 4.49 in |
| Envelope No. 10 | 104.775 × 241.3 mm | 4.13 × 9.5 in |
Frequently asked questions
What size is A7 Envelope (US) in mm?
133.35 × 184.15 mm.
What size is A7 Envelope (US) in inches?
5.25 × 7.25 inches.
What size is A7 Envelope (US) in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1575 × 2175 pixels; at 72 DPI it is only 378 × 522.