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US Envelope Series



Belonging to the ISO A series, the A9 paper size is a compact and versatile choice for various printing needs. This particular size measures 37mm x 52mm, making it one of the smallest dimensions in the ISO A series. Its petite stature allows it to fit comfortably into small envelopes or be used as a ticket stub or business card.

The ISO A series is an internationally recognized standard, ensuring that your A9 paper will be compatible with printers and copiers worldwide. This standardization also guarantees that two half-sheets of any given size will equal the next size down in the series. Thus, two A10 sheets make up an A9 sheet, and two A9 sheets form an A8 sheet.

9 paper dimensions


View All US Envelope 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

Despite its small size, don't underestimate the potential of an A9 paper. It's perfect for delivering concise messages with impact - think event tickets or promotional coupons where space is at a premium but every word counts.

In addition to being part of the ISO family, this diminutive paper size also finds its place within ANSI standards as defined by American National Standards Institute (ANSI). The ANSI B-size corresponds closely to ISO's B-series including B0-B10 sizes which are slightly larger than their respective "A" counterparts.

Interestingly enough, despite its international recognition and usage across various industries globally, many people remain unaware of this unique paper format. This lack of awareness can be leveraged by businesses looking for innovative ways to stand out from their competition - using an uncommon yet standardized format like A9 could just be that distinguishing factor!

Other Formats in the US Envelope Series

Interesting facts about 9

1: The Origins of Paper

Paper was first invented in ancient China around 105 AD by a government official named Cai Lun. He created it by mixing mulberry bark, hemp, and rags with water, then pressing and drying the mixture into thin sheets.

2: The Standard Paper Size

The most commonly used paper size worldwide is known as A4. It measures 210 mm × 297 mm (8.27 in × 11.69 in) and is part of the ISO A series of paper sizes.

3: The ISO Paper Series

The ISO A series of paper sizes, including A0, A1, A2, etc., follows a specific ratio called the square root of two (√2). This means that when you fold an A0 sheet in half along its longest side, you get two equal-sized sheets of the next smaller size (e.g., folding an A0 gives you two A1 sheets).

4: The Largest Paper Size

The largest standardized paper size is called AO or DIN-A0. It measures approximately 841 mm × 1189 mm (33.11 in × 46.81 in). This size is often used for posters or architectural plans.

5: Watermark Identification

A watermark is a translucent design or pattern embedded within the paper during manufacturing to identify its authenticity or origin. By holding a sheet up to light, one can observe these unique watermarks.

6: Specialty Papers

Papers come in various specialty types such as parchment paper (used for baking), carbonless copy paper (creates duplicate copies without carbon paper), and security paper (with anti-counterfeit features like holograms or UV-reactive fibers).

7: Paper Recycling

Paper is one of the most recycled materials globally. It can be recycled up to seven times before the fibers become too short and weak for further use.

8: The Gutenberg Bible

The Gutenberg Bible, printed by Johannes Gutenberg in the 1450s, was the first major book printed using movable type on a printing press. It played a significant role in the spread of literacy and knowledge.

9: Japanese Washi Paper

Washi is a traditional Japanese paper made from plant fibers such as mulberry, bamboo, or rice straw. It is known for its strength, durability, and resistance to aging.

10: The Paperless Office Myth

Despite advancements in digital technology, the concept of a completely paperless office has not been fully realized. Many industries still rely heavily on physical documents due to legal requirements or personal preferences.