ISO C series (envelopes)

C2 envelope size

C2 envelope measures 458 x 648 mm (18.03 x 25.51 in). Part of the ISO C series (envelopes).

458 x 648millimetres

18.03 x 25.51inches

5,409 x 7,654pixels @ 300 dpi

Dimensions in every unit

Unit	Width x height
Millimetres	458 x 648 mm
Centimetres	45.8 x 64.8 cm
Inches (decimal)	18.031 x 25.512 in
Inches (fraction)	18 1/16 x 25 1/2 in
Points (1/72 in)	1298.3 x 1836.9 pt
Picas	108.19 x 153.07 pc

Pixel dimensions by resolution

Resolution	Pixels	Megapixels
72 dpi	1,298 x 1,837 px	2.4 MP
96 dpi	1,731 x 2,449 px	4.2 MP
150 dpi	2,705 x 3,827 px	10.4 MP
200 dpi	3,606 x 5,102 px	18.4 MP
300 dpi	5,409 x 7,654 px	41.4 MP
600 dpi	10,819 x 15,307 px	165.6 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)	464 x 654 mm	18.268 x 25.748 in
0.125 in bleed (each side)	464.4 x 654.4 mm	18.281 x 25.762 in

How many C2 envelope fit on a press sheet

Sheet	Without bleed	With 3 mm bleed
B2 (offset)	1-up	1-up
B1 (offset)	2-up	2-up

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

The √2 system

C2 envelope has an aspect ratio of 1 : 1.4148 — 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 C2 envelope?

C2 envelope is 458 x 648 mm, which is 18.03 x 25.51 in (18 1/16 x 25 1/2 in).

How many pixels is C2 envelope at 300 DPI?

5,409 x 7,654 pixels at 300 dpi, or 2,705 x 3,827 at 150 dpi.

Sources & data

Dimensions per the relevant standard; see sources.