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Poster Series



Delving into the realm of paper sizes, one encounters an intriguing dimension: 81x81. This square format, uncommon yet fascinating, does not conform to any standard ISO or ANSI series. Instead, it carves out its own unique niche in the world of paper dimensions.

The 81x81 size is a perfect square, a rarity in an industry dominated by rectangular formats. This symmetry lends itself to a variety of creative applications. From origami enthusiasts to graphic designers seeking a break from convention, this size offers an enticing canvas for artistic expression.

81×81 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 enough, the 81x81 format also holds appeal for mathematical applications. The area of this paper size is precisely 6561 square units - a number that's not only a perfect square itself but also happens to be the ninth power of three (3^8). This numerical peculiarity may seem trivial at first glance but can serve as an engaging teaching tool in educational settings.

While the 81x81 paper size may not fit within traditional ISO or ANSI standards, it stands as testament to the diversity and flexibility inherent in paper dimensions. Its unique properties and potential uses make it more than just another number on a chart; it's proof that even within standardized systems, there's always room for individuality and innovation.

Other Formats in the Poster Series

Interesting facts about 81×81

1: The 81x81 paper size is not a standard international paper size.

The 81x81 paper size does not belong to any of the standard international paper series, such as A, B, or C. It is considered a non-standard or custom size.

2: The aspect ratio of 81x81 paper is exactly 1:1.

The dimensions of the 81x81 paper are equal, resulting in a perfect square shape. This makes it ideal for certain applications that require symmetry and balance.

3: It can be used for unique artistic projects.

The unconventional size of the 81x81 paper can inspire artists and designers to create unique and eye-catching artworks. Its square shape allows for interesting compositions and creative freedom.

4: Limited availability may make it more expensive.

Since the 81x81 paper is not a standard size, it may be less commonly available in stationery stores or print shops. This limited availability can lead to higher costs compared to more widely used sizes.

5: Custom cutting might be required for printing on this size.

If you plan to print on an 81x81 sheet, you may need to have it custom cut from a larger parent sheet by a professional printer. This ensures accurate dimensions and clean edges for your printed materials.

6: It can be used for large-scale origami projects.

The larger surface area provided by the dimensions of an 8