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US Envelope Series



Belonging to the ISO 216 standard, A4 is a globally recognized paper size. With dimensions of 210 x 297 millimeters or 8.27 x 11.69 inches, it's a staple in offices and educational institutions worldwide.

The A4 paper size is part of the A series in the ISO standard, which starts from A0 (the largest) down to A10 (the smallest). The unique aspect of this series is its aspect ratio - an unvarying ratio of width to height that's approximately equal to the square root of two. This means when you cut or fold an A-series sheet in half along its longest side, you'll get two smaller sheets with the same proportions as the original.

12 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

Interestingly, this mathematical precision makes it easy for scaling documents without distorting their layout or text - a feature that graphic designers and printers greatly appreciate.

In contrast to North America's letter-sized paper (8.5 x 11 inches), which follows ANSI standards, A4 is slightly narrower and longer. This difference can sometimes lead to formatting issues when exchanging documents between regions using different standards.

Despite these minor challenges, the versatility and widespread acceptance of A4 make it an indispensable tool in global communication and documentation.

Other Formats in the US Envelope Series

Interesting facts about 12

1: The Origins of A Series Paper Sizes

The A series paper sizes, including A12, were first introduced in the 19th century by a German scientist and inventor named Georg Christoph Lichtenberg. These sizes were based on mathematical principles to create a consistent ratio between width and height.

2: The Golden Ratio Connection

The dimensions of A12 paper follow the golden ratio, which is approximately 1.618. This ratio is considered aesthetically pleasing and has been used in various art forms throughout history.

3: Rarely Used Size

A12 paper is an extremely rare size that is not commonly found or used in standard printing practices. Its small dimensions make it impractical for most applications.

4: Specialty Applications

A12 paper may find limited use in specialized fields such as microprinting or miniature artwork due to its compact size. However, these applications are highly uncommon.

5: Historical Significance

In the past, smaller paper sizes like A12 were occasionally used for personal correspondence or writing notes due to their convenient portability. However, with the advent of digital communication, such usage has significantly declined.

6: Paper Weight Considerations

A12 paper would typically have a lower weight compared to larger formats since it requires less material for production. This makes it more delicate and prone to tearing if mishandled.

7: Limited Availability

Finding pre-cut A12 paper can be challenging as most commercial printers do not stock this size due to its rarity. Custom cutting may be required for specific projects requiring this particular dimension.

8: Niche Collectors' Item

Due to its scarcity, A12 paper can be sought after by collectors of rare and unusual paper sizes. Some enthusiasts enjoy collecting various paper formats as a hobby.

9: Experimental Artistic Medium

A12 paper's small size can inspire artists to explore unique creative possibilities. It challenges them to work within constraints and encourages innovative approaches to composition.

10: Environmental Considerations

The production of A12 paper, like any other type of paper, requires the use of natural resources such as trees and water. Opting for digital alternatives or recycling used paper helps reduce environmental impact.