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International Envelope Series



Belonging to the ISO 216 standard, the X9 paper size is a unique and often overlooked member of this globally recognized series. This specific size, while not as commonly used as its A4 or A3 counterparts, holds its own distinctive place within the realm of standardized paper sizes.

The X9 paper size measures precisely 241mm by 279mm. This makes it slightly wider and shorter than the popular A4 size, which measures 210mm by 297mm. The difference in dimensions lends itself to specific applications where traditional sizes may not be as effective.

X9 paper dimensions


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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, X9 is part of an ANSI series rather than an ISO series. The American National Standards Institute (ANSI) developed this series to cater to North American usage patterns. It's worth noting that while ISO standards are widely accepted internationally, ANSI standards like X9 have a strong foothold in the United States.

One fascinating aspect about X9 is its close resemblance to 'Letter' size - another popular paper format in North America. However, unlike 'Letter', which has rounded measurements (8.5" x 11"), X9 maintains precise metric dimensions - a testament to its adherence to international measurement systems despite being part of an American standard.

While it may not be as ubiquitous as other formats, the X9 paper size carries with it a rich history and unique characteristics that make it stand out within both ISO and ANSI standards.

Other Formats in the International Envelope Series

Interesting facts about X9

1: X9 paper is a part of the ANSI/ASME Y14.1 Paper Sizes series

X9 paper is one of the sizes included in the ANSI/ASME Y14.1 Paper Sizes series, which is a set of standardized paper sizes used primarily in engineering and technical drawings.

2: X9 paper measures 11 x 17 inches

The dimensions of X9 paper are 11 inches by 17 inches (279 mm by 432 mm). It is commonly referred to as "Tabloid" or "Ledger" size.

3: X9 paper can be folded to create a booklet

Due to its larger size, X9 paper can be conveniently folded in half to create a booklet with four pages. This makes it useful for creating brochures, newsletters, and other printed materials.

4: X9 paper is often used for architectural and engineering drawings

X9 paper's larger size makes it ideal for architectural and engineering drawings that require more space for detailed plans, diagrams, and blueprints.

5: The origin of the name "Tabloid"

The term "Tabloid" originated from the practice of folding newspapers like the London-based newspaper "The Times" into half its broadsheet size. This folding technique was later applied to X9-sized papers as well.

6: The history of Ledger-sized papers

Ledger-sized papers have their roots in medieval times when accountants used large sheets called ledgers to record financial transactions. These ledgers were typically made from parchment or vellum.

7: Tabloid-sized papers are commonly used in the newspaper industry

Tabloid-sized papers, including X9 paper, are frequently used in the newspaper industry for printing tabloid-style newspapers. This format is often associated with more compact and sensationalized news articles.

8: X9 paper is compatible with most office printers

X9 paper's dimensions of 11 x 17 inches make it compatible with many standard office printers. This allows for easy printing of documents without requiring specialized equipment.

9: The popularity of X9 paper in graphic design

X9 paper's larger size has made it a popular choice among graphic designers for creating posters, flyers, and other visual materials that require more space to showcase artwork and designs.

10: The international equivalent of X9 paper

The international equivalent of X9 paper is known as A3 size. While they have slightly different dimensions (297 mm by 420 mm), both sizes serve similar purposes and offer comparable space for drawings and prints.