ISO C series (envelopes)

C7 envelope size

C7 envelope measures 81 x 114 mm (3.19 x 4.49 in). Envelope for A7 cards.

81 x 114millimetres

3.19 x 4.49inches

957 x 1,346pixels @ 300 dpi

Dimensions in every unit

Unit	Width x height
Millimetres	81 x 114 mm
Centimetres	8.1 x 11.4 cm
Inches (decimal)	3.189 x 4.488 in
Inches (fraction)	3 3/16 x 4 1/2 in
Points (1/72 in)	229.6 x 323.1 pt
Picas	19.13 x 26.93 pc

Pixel dimensions by resolution

Resolution	Pixels	Megapixels
72 dpi	230 x 323 px	0.1 MP
96 dpi	306 x 431 px	0.1 MP
150 dpi	478 x 673 px	0.3 MP
200 dpi	638 x 898 px	0.6 MP
300 dpi	957 x 1,346 px	1.3 MP
600 dpi	1,913 x 2,693 px	5.2 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)	87 x 120 mm	3.425 x 4.724 in
0.125 in bleed (each side)	87.4 x 120.4 mm	3.439 x 4.738 in

How many C7 envelope fit on a press sheet

Sheet	Without bleed	With 3 mm bleed
A4	4-up	4-up
A3	10-up	9-up
SRA3	10-up	10-up
Letter	4-up	4-up
Tabloid 11 x 17 in	10-up	9-up
12 x 18 in	12-up	10-up
13 x 19 in (Super B)	16-up	12-up
B2 (offset)	36-up	32-up
B1 (offset)	72-up	64-up

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

The √2 system

C7 envelope has an aspect ratio of 1 : 1.4074 — 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 C7 envelope?

C7 envelope is 81 x 114 mm, which is 3.19 x 4.49 in (3 3/16 x 4 1/2 in).

How many pixels is C7 envelope at 300 DPI?

957 x 1,346 pixels at 300 dpi, or 478 x 673 at 150 dpi.

Sources & data

Dimensions per the relevant standard; see sources.