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The ISO-269 standard specifies the following:

Format  A                               B                               C
Size    mm × mm         in × in         mm × mm         in × in         mm × mm         in × in
0       841 × 1189      33.1 × 46.8     1000 × 1414     39.4 × 55.7     917 × 1297      36.1 × 51.1
1       594 × 841       23.4 × 33.1     707 × 1000      27.8 × 39.4     648 × 917       25.5 × 36.1
2       420 × 594       16.5 × 23.4     500 × 707       19.7 × 27.8     458 × 648       18.0 × 25.5
3       297 × 420       11.7 × 16.5     353 × 500       13.9 × 19.7     324 × 458       12.8 × 18.0
4       210 × 297       8.27 × 11.7     250 × 353       9.84 × 13.9     229 × 324       9.02 × 12.8
5       148 × 210       5.83 × 8.27     176 × 250       6.93 × 9.84     162 × 229       6.38 × 9.02
6       105 × 148       4.13 × 5.83     125 × 176       4.92 × 6.93     114 × 162       4.49 × 6.38
7       74 × 105        2.91 × 4.13     88 × 125        3.46 × 4.92     81 × 114        3.19 × 4.49
8       52 × 74         2.05 × 2.91     62 × 88         2.44 × 3.46     57 × 81         2.24 × 3.19
9       37 × 52         1.46 × 2.05     44 × 62         1.73 × 2.44     40 × 57         1.57 × 2.24
10      26 × 37         1.02 × 1.46     31 × 44         1.22 × 1.73     28 × 40         1.10 × 1.57

All aspect ratios are 1: root2 (dividing A4 en 2 pieces gives A5)
The B sizes are the geometric mean between the A sizes (this means that enlargement from A4 to B4 
is the same enlargement as B4 to A3)
The same counts for the C sizes.
C-sizes re used for envelopes where an A4 letter fits in a C4 envelope, of if folded once over the 
long side it fits in a C5 envelope.

Only in the US, Canada and Mexico different sizes are used:

Size            Width x Height  Width x Height) Aspect Ratio
Letter          216 x 279 mm    8.5 x 11.0 in   1:1.2941
Legal           216 x 356 mm    8.5 x 14.0 in   1:1.6471
Junior Legal    127 x 203 mm    5.0 x 8.0 in    1:1.6000
Ledger/Tabloid  279 x 432 mm    11.0 x 17.0 in  1:1.5455

There are ANSI standards size A through E where each next size doubles the short smaller side, 
staring at size A (which is letter).
So US B size is 11 x 17 in.

Theres id a nice overview on wiki to be found here: http://en.wikipedia.org/wiki/Paper_size 

Rob.


Op 26 jul. 2014, om 16:54 heeft Mark Bourne het volgende geschreven:



Kracked_P_P---webmaster wrote:
As for your description of A-size - - -  8.5 x 11 inches is not an A
size that I have heard of.  It is US Letter.  I have never seen any
reference that US Letter described as "A" size. The closest is A4, but
A4 is a little narrower and a little taller.

B is 11x17 inches - also called Tabloid.
Super B is 13x19 inches

JB4 - 257x364 mm
B5 - 176x250 mm
JB5 - 182x257 mm

A6 - 105x148 mm
A5 - 148x210
A4 - 210x297
A3 - 297x420
A3+ - 330x483 mm

These sizes are according to my HP Officejet 7000 wide format printer.
Since it does not print larger than Super B, I do not know the actual
inches for C or E sizes. [except C6 "Envelope" - 114x162 mm]

http://www.papersizes.org/ is quite handy for looking up paper sizes. It also explains how the 
ISO (A4 etc.) sizes are actually defined - e.g. A0 has an area of 1 square metre, and aspect 
ratio of 1:sqrt(2) (which gives it the property that cutting a page in half along it's long edge 
results in a smaller page of the same aspect ratio), then each subsequent A-series size is 
derived by cutting the previous size in half.

The US ANSI A, B, C, D and E sizes are not related to the ISO A-, B- and C-series sizes. So ANSI 
A is nothing to do with ISO A4 (although it happens to be very roughly the same size), and ANSI C 
nothing to do with ISO C6.

Mark.

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