Envelope No. 10 paper size
104.775 × 241.3 mm
4.13 × 9.5 inches · 10.48 × 24.13 cm · aspect ratio 1:2.3
Envelope No. 10 size is 104.775 × 241.3 mm. Those are the Envelope No. 10 dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What Envelope No. 10 is for
The No. 10 envelope, 4.125 × 9.5 inches, is the standard US business envelope and the one nearly every American window envelope, mail-merge template and printer tray setting assumes. It takes a Letter sheet folded into thirds, which makes it the North American counterpart to DL — and it is 3 mm wider and 21 mm longer than DL, close enough that the two look interchangeable and different enough that a windowed template designed for one shows the address in the wrong place on the other.
Envelope No. 10 dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 104.775 mm | 241.3 mm |
| Centimetres | 10.48 cm | 24.13 cm |
| Inches | 4.13 in | 9.5 in |
| Points (PostScript) | 297 pt | 684 pt |
Envelope No. 10 in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. Envelope No. 10 size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 297 × 684 | Screen preview only — far too coarse to print |
| 150 DPI | 619 × 1425 | Draft printing, internal documents |
| 300 DPI | 1238 × 2850 | The standard for commercial print |
| 600 DPI | 2475 × 5700 | 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 Envelope No. 10 relates to the rest of the series
At 104.775 × 241.3 mm (4.13 × 9.5 inches) the aspect ratio is 1:2.303. 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 Photo 4×6 at 101.6 × 152.4 mm, with a few millimetres to spare on each edge.
Folded, the largest standard sheet it takes is a Letter sheet folded in three.
About Envelope No. 10
4.125 × 9.5 inches, the standard US business envelope.
Other US envelope sizes sizes
| Size | Millimetres | Inches |
|---|---|---|
| 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 |
| A8 Envelope (US) | 139.7 × 206.375 mm | 5.5 × 8.13 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 Envelope No. 10 in mm?
104.775 × 241.3 mm.
What size is Envelope No. 10 in inches?
4.13 × 9.5 inches.
What size is Envelope No. 10 in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1238 × 2850 pixels; at 72 DPI it is only 297 × 684.