Skip to main content

German Series



Belonging to the DIN series, C9 is a paper size that adheres to the ISO 216 international standard. This standard, recognized globally, ensures consistency in dimensions across various paper sizes. The C9 size specifically measures 40 x 57 millimeters, making it one of the smaller formats within the DIN series.

Interestingly, the C9 size is part of an ingenious system where each subsequent size is half of its predecessor when folded parallel to its shorter sides. This unique feature allows for seamless scaling and resizing without distorting content or compromising legibility.

DIN C9 paper dimensions


View All German 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

The compact dimensions of C9 make it ideal for specific applications such as creating small envelopes or inserts. It's also commonly used in direct mail marketing due to its cost-effectiveness and convenience for recipients.

While not as widely recognized as A4 or other ANSI series sizes in some regions, understanding and utilizing C9 can provide a competitive edge in certain industries. Its unique characteristics offer opportunities for innovative design and efficient use of space that can enhance communication effectiveness.

DIN C9 is more than just a paper size—it's a tool with potential to optimize your print communications strategy when used thoughtfully and creatively.

Other Formats in the German Series

Interesting facts about DIN C9

1: DIN C9 Paper Size

DIN C9 is a paper size that measures 162 mm × 229 mm (6.38 in × 9.02 in). It belongs to the DIN series of paper sizes, which are widely used in Europe and other parts of the world.

2: Origin of DIN Paper Sizes

The DIN paper sizes were first introduced by the German Institute for Standardization (Deutsches Institut für Normung) in the early 20th century. The goal was to establish a standardized system for paper sizes to facilitate international communication and printing.

3: Proportional Ratios

The DIN series follows a consistent ratio between its dimensions. Each size is obtained by halving the longer side of the previous size, resulting in a constant aspect ratio of approximately 1:1.4142.

4: C Series Envelopes

DIN C9 is primarily used as an envelope size rather than a standalone sheet of paper. It is commonly used for mailing invitations, greeting cards, or small documents that require an elegant presentation.

5: Compatibility with A Series

The DIN C series envelopes are designed to perfectly fit their corresponding A series sheets. For example, an A5 sheet (148 mm × 210 mm) fits precisely into a C5 envelope (162 mm × 229 mm), providing a neat and professional appearance when mailed.

6: Uncommon Usage

DIN C9 is one of the less commonly used sizes within the DIN series due to its specific dimensions. However, it still serves niche purposes where its unique proportions are desired or required.

7: Specialized Printing

Due to its smaller size, DIN C9 is often used for specialized printing applications such as business cards, small brochures, or compact informational leaflets. Its dimensions offer a distinct layout and design possibilities.

8: Historical Significance

The DIN paper sizes have a rich historical significance as they were developed during a time when standardization was crucial for international trade and communication. They have since become widely adopted across the globe.

9: ISO Standardization

In 1975, the International Organization for Standardization (ISO) adopted the DIN paper sizes as an international standard known as ISO 216. This further solidified their usage and compatibility worldwide.

10: Global Adoption

The DIN series of paper sizes, including DIN C9, are used in many countries around the world. However, some regions like North America primarily use different standards such as Letter or Legal sizes.