DL paper size
110 × 220 mm
4.33 × 8.66 inches · 11 × 22 cm · aspect ratio 1:2
DL size is 110 × 220 mm. Those are the DL dimensions a printer works to; the same sheet in centimetres, inches, points and pixels is below.
What DL is for
DL is the standard business envelope across most of Europe at 110 × 220 mm, sized to take an A4 sheet folded into thirds. It is not geometrically part of the C series — its proportions do not follow the 1:√2 rule — but it is sold and specified alongside it, and a DL envelope fits inside a C4 for mailing packs. The name is short for Dimension Lengthwise.
DL dimensions in every unit
| Unit | Width | Height |
|---|---|---|
| Millimetres | 110 mm | 220 mm |
| Centimetres | 11 cm | 22 cm |
| Inches | 4.33 in | 8.66 in |
| Points (PostScript) | 312 pt | 624 pt |
DL in pixels
Pixel dimensions depend entirely on the resolution you are working at — there is no single "pixel size" for a sheet of paper. DL size in pixels has every resolution, with file sizes and canvas setup.
| Resolution | Pixels | Use |
|---|---|---|
| 72 DPI | 312 × 624 | Screen preview only — far too coarse to print |
| 150 DPI | 650 × 1299 | Draft printing, internal documents |
| 300 DPI | 1299 × 2598 | The standard for commercial print |
| 600 DPI | 2598 × 5197 | 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 DL relates to the rest of the series
At 110 × 220 mm (4.33 × 8.66 inches) the aspect ratio is 1:2.000. This size is not part of a halving series, so there is no fixed scaling factor to the next size up or down — each one is defined on its own terms.
The closest ISO sheet by area is A5 at 148 × 210 mm — this size is 22% smaller. The proportions differ, though: A5 is 1:1.414 like every A size, and this one is 1:2.000, so content laid out for one does not fill the other without cropping or white space.
About DL
The standard business envelope in Europe — takes an A4 sheet folded into thirds. Technically not part of the C series but used alongside it.
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 |
| C3 | 324 × 458 mm | 12.76 × 18.03 in |
| C7 | 81 × 114 mm | 3.19 × 4.49 in |
Frequently asked questions
What size is DL in mm?
110 × 220 mm.
What size is DL in inches?
4.33 × 8.66 inches.
What size is DL in pixels?
There is no single answer — it depends on resolution. At the print standard of 300 DPI it is 1299 × 2598 pixels; at 72 DPI it is only 312 × 624.