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C Series



Belonging to the ISO 269 standard, the C12 paper size is a unique and often overlooked member of the C series. This specific size measures 37mm by 52mm, making it one of the smallest in its series. Its compact dimensions make it an ideal choice for specific applications where space is at a premium.

The C series, including C12, was designed with envelopes in mind. The sizes are defined in such a way that each envelope can accommodate the A and B series paper of the same number. Thus, a C12 envelope would be perfect for an A12 or B12 sheet of paper.

C12 paper dimensions


View All C Series

2A046.81 x 66.221189 x 1682119 x 1683370 x 4768
A120.51 x 0.7113 x 181 x 237 x 51
4A066.22 x 93.621682 x 2378168 x 2384768 x 6741
A110.71 x 1.0218 x 262 x 351 x 74
A101.02 x 1.4626 x 373 x 474 x 105
A3+12.95 x 19.02329 x 48333 x 48933 x 1369
A1+23.98 x 35.98609 x 91461 x 911726 x 2591
A0+35.98 x 50.87914 x 129291 x 1292591 x 3662
A64.13 x 5.83105 x 14811 x 15298 x 420
A55.83 x 8.27148 x 21015 x 21420 x 595
A48.27 x 11.69210 x 29721 x 30595 x 842
A311.69 x 16.54297 x 42030 x 42842 x 1191
A91.46 x 2.0537 x 524 x 5105 x 147
A216.54 x 23.39420 x 59442 x 591191 x 1684
A82.05 x 2.9152 x 745 x 7147 x 210
A123.39 x 33.11594 x 84159 x 841684 x 2384
A72.91 x 4.1374 x 1057 x 11210 x 298
A033.11 x 46.81841 x 118984 x 1192384 x 3370

Interestingly enough, despite its small size and seemingly limited use, C12 plays an essential role in various industries. For instance, it's commonly used in printing business cards or labels due to its compact nature.

Moreover, being part of both ISO (International Organization for Standardization) and ANSI (American National Standards Institute) standards ensures that this paper size maintains universal recognition and application across different countries and industries.

While it may not be as widely recognized as its larger counterparts like A4 or Letter sizes, the humble C12 holds its own unique place within the world of standardized paper sizes. Its versatility combined with international standardization makes it an invaluable asset across various professional fields.

Other Formats in the C Series

Interesting facts about C12

1: C12 paper is part of the ISO 216 standard

C12 paper is a specific size within the ISO 216 standard, which defines international paper sizes. It is commonly used for architectural drawings and blueprints.

2: C12 paper measures approximately 324mm x 458mm

The dimensions of C12 paper are approximately 324mm x 458mm (12.8in x 18in). It has a unique aspect ratio that allows for easy scaling and resizing.

3: C12 paper is larger than A3 and smaller than A2

In the ISO paper size series, C12 falls between A3 and A2. This means that it is larger than A3 but smaller than A2 in terms of dimensions.

4: The C series was originally developed for envelopes

The C series of paper sizes was initially created for envelopes, with each size being designed to perfectly fit into the next larger envelope size. However, these sizes are now commonly used for various printing purposes as well.

5: The aspect ratio of C12 paper is approximately √2

The aspect ratio (width-to-height ratio) of C12 paper is approximately √2 (1:√2), which means that when you cut it in half along its longer side, you get two sheets with the same proportions as the original sheet.

6: The ISO standard for papers sizes originated from Germany

The ISO standard for papers sizes, including the C series, originated from Germany in the early twentieth century. It was later adopted internationally to ensure compatibility and ease of use across different countries.

7: C12 paper is not commonly used in everyday printing

While C12 paper has its specific uses, it is not commonly found in everyday printing or office settings. Its larger size makes it more suitable for specialized applications such as architectural plans or technical drawings.

8: The ISO 216 standard is based on the earlier DIN 476 standard

The ISO 216 standard, which includes the C series of paper sizes, is based on the earlier German DIN 476 standard. The DIN standard was revised and expanded to become the international ISO standard we use today.

9: C12 paper can be easily scaled to other sizes

One of the advantages of using C12 paper is its easy scalability. By simply halving or doubling its dimensions, you can obtain other common sizes within the ISO series, such as A3 or A2.

10: The C series provides a wide range of options for different needs

The C series of paper sizes offers a wide range of options to cater to various needs. From smaller sizes like C0 (largest) to larger ones like C10 (smallest), these papers provide flexibility and versatility in printing and design projects.