International Standard: ISO 216 (metric-based papers)

The International Standard ISO 216 is a paper size standard that has been adopted by majority of the countries of the world. It is a metric-based system with a consistent ratio (1:1.4142) so that each size can be divided evenly into smaller half sheets. The benefit is that printed materials can easily be reproduced in different sizes without having to crop or change the layout of the item being printed. This optimizes the printer's costs by allowing them to use the the entire parent sheet and prevents excess paper from being wasted.

There are 3 commonly used parent sizes which include:

  • A series – These sizes are the most commonly used for business documents and everyday use.
  • B Series – These sizes are often used for posters, books, envelopes, and passports.
  • C Series – These sizes are used for constructing envelopes as they are slightly larger than the A series so that a C4 envelope with fit an A4 piece of paper for example.

International Paper Sizes

The ISO 216 standard has been adopted by the United Nations and the following countries:

Australia
Austria
Bangladesh
Barbados
Belgium
Chile
Colombia
Czechoslovakia
Denmark
Ecuador
Finland
France
Greece
Hungary
Iceland
India
Iran
Ireland
Israel
Italy
Japan
Kuwait
Mexico
Netherlands
New Zealand
Norway
Peru
Poland
Portugal
Rhodesia
Romania
Singapore
South Africa
Soviet Union
Spain
Sweden
Switzerland
Thailand
Turkey
United Kingdom
Venezuela
Yugoslavia

There are also other standards or variances known as extensions in a few countries that are not listed here.


Click on an item number to get more information about its size and style. Size fits card and envelope.





Format Metric Inches No Flap Biodegradable No Flap Flap Seal Biodegradable Flap Seal Protective Closure Hanging
A0 841 x 1189 33.1" x 46.8" - - B4735* - - -
A1 594 x 841 23.4" x 33.1" - - BA1 - BA1PC -
A2 420 x 594 16.5" x 23.4" - - BA2 - BA2PC -
A3 297 x 420 11.7" x 16.5" - - BA3 - BA3PC -
A4 210 x 297 8.3" x 11.7" - - BA4 - BA4PC HBA4
A5 148 x 210 5.8" x 8.3" - - BA5S - BA5SPC -
A6 105 x 148 4.1" x 5.8" - - BA6S - BA6SPC -
A7 74 x 105 2.9" x 4.1" B34CNF - B34 - - HB34
A8 52 x 74 2" x 2.9" - - B23 - - HB23
A9 37 x 52 1.5" x 2" - - - - - -
A10 26 x 37 1" x 1.5" - - - - - -
B0 1000 x 1414 39.4" x 55.7" - - B6040** - - -
B1 707 x 1000 27.8" x 39.4" - - B4432** - - -
B2 500 x 707 19.7" x 27.8" - - B2028 - - -
B3 353 x 500 13.9" x 19.7" - - - - - -
B4 250 x 353 9.8" x 13.9" - - - - - -
B5 176 x 250 6.9" x 9.8" - - B711* - - -
B6 125 x 176 4.9" x 6.9" B75NF GR75NF B75S - B75SPC HB75
B7 88 x 125 3.5" x 4.9" - - B35 - - -
B8 62 x 88 2.4" x 3.5" B23CNF - B2XL - - HB23
B9 44 x 62 1.7" x 2.4" - - - - - -
B10 31 x 44 1.2" x 1.7" - - - - - -
C0 917 x 1297 36.1" x 51.1" - - B6040** - - -
C1 648 x 917 25.5" x 36.1" - - B36* - - -
C2 458 x 648 18" x 25.5" - - - - - -
C3 324 x 458 12.8" x 18" - - - - - -
C4 229 x 324 9" x 12.8" - - B913 - - HB913
C5 162 x 229 6.4" x 9" - - B610* - - HB610*
C6 114 x 162 4.5" x 6.4" - - B56M - - HB56
C7 81 x 114 3.2" x 4.5" - - B3X6* - - -
C8 57 x 81 2.2" x 3.2" B2NF - B2 - B2PC HB2
C9 40 x 57 1.6" x 2.2" - - B1X2XL* - - -
C10 28 x 40 1.1" x 1.6" B1X2NF - - - - -

*The width fits, but the length is longer. Simply fold the adhesive flap down and seal it lower on the bag to create a snug fit.
**The width and the length is longer. Fold the adhesive flap down and seal it lower on the bag. Then fold and tape the excess width to make a snug fit.