ISO C series (envelopes)

DL envelope size

DL envelope measures 110 x 220 mm (4.33 x 8.66 in). Holds A4 folded in thirds — the standard European letter envelope.

110 x 220millimetres

4.33 x 8.66inches

1,299 x 2,598pixels @ 300 dpi

Dimensions in every unit

Unit	Width x height
Millimetres	110 x 220 mm
Centimetres	11 x 22 cm
Inches (decimal)	4.331 x 8.661 in
Inches (fraction)	4 5/16 x 8 11/16 in
Points (1/72 in)	311.8 x 623.6 pt
Picas	25.98 x 51.97 pc

Pixel dimensions by resolution

Resolution	Pixels	Megapixels
72 dpi	312 x 624 px	0.2 MP
96 dpi	416 x 831 px	0.3 MP
150 dpi	650 x 1,299 px	0.8 MP
200 dpi	866 x 1,732 px	1.5 MP
300 dpi	1,299 x 2,598 px	3.4 MP
600 dpi	2,598 x 5,197 px	13.5 MP

300 dpi is the usual target for printed photos and artwork; 72–96 dpi is screen resolution.

Document size with bleed

Bleed	Millimetres	Inches
3 mm bleed (each side)	116 x 226 mm	4.567 x 8.898 in
0.125 in bleed (each side)	116.4 x 226.4 mm	4.581 x 8.911 in

How many DL envelope fit on a press sheet

Sheet	Without bleed	With 3 mm bleed
A4	1-up	1-up
A3	3-up	3-up
SRA3	4-up	3-up
Letter	1-up	1-up
Tabloid 11 x 17 in	3-up	3-up
12 x 18 in	4-up	4-up
13 x 19 in (Super B)	6-up	4-up
B2 (offset)	12-up	12-up
B1 (offset)	27-up	24-up

Simple grid imposition with no gutters or gripper margin; real layouts may fit fewer.

The √2 system

DL envelope has an aspect ratio of 1 : 2 — close to √2 (1.4142). Folding or cutting it in half across the long side produces the next smaller size in the series with the same proportions, and two sheets side by side form the next larger size. This is why scaling between sizes in the series (for example on a photocopier) never crops or distorts the page.

Frequently asked questions

What are the dimensions of DL envelope?

DL envelope is 110 x 220 mm, which is 4.33 x 8.66 in (4 5/16 x 8 11/16 in).

How many pixels is DL envelope at 300 DPI?

1,299 x 2,598 pixels at 300 dpi, or 650 x 1,299 at 150 dpi.

Sources & data

Dimensions per the relevant standard; see sources.