ISO C series (envelopes)

C6 envelope size

C6 envelope measures 114 x 162 mm (4.49 x 6.38 in). Envelope for A4 folded twice, or A6 cards.

114 x 162millimetres

4.49 x 6.38inches

1,346 x 1,913pixels @ 300 dpi

Dimensions in every unit

Unit	Width x height
Millimetres	114 x 162 mm
Centimetres	11.4 x 16.2 cm
Inches (decimal)	4.488 x 6.378 in
Inches (fraction)	4 1/2 x 6 3/8 in
Points (1/72 in)	323.1 x 459.2 pt
Picas	26.93 x 38.27 pc

Pixel dimensions by resolution

Resolution	Pixels	Megapixels
72 dpi	323 x 459 px	0.1 MP
96 dpi	431 x 612 px	0.3 MP
150 dpi	673 x 957 px	0.6 MP
200 dpi	898 x 1,276 px	1.1 MP
300 dpi	1,346 x 1,913 px	2.6 MP
600 dpi	2,693 x 3,827 px	10.3 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)	120 x 168 mm	4.724 x 6.614 in
0.125 in bleed (each side)	120.4 x 168.4 mm	4.738 x 6.628 in

How many C6 envelope fit on a press sheet

Sheet	Without bleed	With 3 mm bleed
A4	2-up	2-up
A3	4-up	4-up
SRA3	4-up	4-up
Letter	2-up	2-up
Tabloid 11 x 17 in	4-up	4-up
12 x 18 in	4-up	4-up
13 x 19 in (Super B)	8-up	4-up
B2 (offset)	18-up	16-up
B1 (offset)	36-up	32-up

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

The √2 system

C6 envelope has an aspect ratio of 1 : 1.4211 — 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 C6 envelope?

C6 envelope is 114 x 162 mm, which is 4.49 x 6.38 in (4 1/2 x 6 3/8 in).

How many pixels is C6 envelope at 300 DPI?

1,346 x 1,913 pixels at 300 dpi, or 673 x 957 at 150 dpi.

Sources & data

Dimensions per the relevant standard; see sources.