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International Envelope Series



Belonging to the ISO 216 standard, the X5 paper size is a unique and often overlooked member of this globally recognized series. This particular size, while not as commonly used as its A4 or A3 counterparts, holds its own distinctive place within the realm of standardized paper dimensions.

The X5 paper size is part of an intriguing system that's based on a logical and practical aspect ratio of √2:1. This ratio ensures that when a sheet is divided in half, the resulting halves maintain the same aspect ratio as the original sheet. It's this ingenious design principle that allows for seamless scaling between different sizes within the ISO 216 series.

X5 paper dimensions


View All International 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

While it may not be your go-to choice for everyday printing needs, X5 has found its niche in specific applications. For instance, it's frequently utilized in creating detailed technical drawings or architectural plans where precision and ample space are paramount.

Interestingly enough, despite being part of an international standard, X5 isn't universally adopted across all regions. In North America for example, they prefer to use their own ANSI series which includes sizes such as 'Letter' and 'Legal'. However, even amidst these regional preferences, X5 continues to hold its ground due to its inherent versatility and adaptability.

While it may not be at the forefront of common paper sizes like A4 or Letter size from ANSI series; X5 remains an integral part of ISO 216 standard with unique applications and characteristics that make it stand out in its own right.

Other Formats in the International Envelope Series

Interesting facts about X5

1: X5 Paper Size

X5 paper is a lesser-known paper size that measures 176 x 250 millimeters. It falls under the ISO 216 standard, which is widely used for paper sizes globally.

2: Origin of X5 Paper

The X series of paper sizes was introduced in the early 20th century by Dr. Walter Porstmann, a German engineer. The X5 size was specifically designed to optimize space utilization and reduce waste when printing certain types of documents.

3: Common Uses

X5 paper is commonly used for various purposes such as printing booklets, brochures, flyers, and small-sized documents that require a compact layout.

4: Similarity to A6 Paper

The dimensions of X5 paper are quite similar to the popular A6 size (105 x 148 millimeters). However, the aspect ratio differs slightly between the two sizes.

5: Compatibility with Other Sizes

X5 paper can be easily scaled from larger or smaller ISO sizes within the same series. For example, two sheets of X6 can be combined to form an X5 sheet without any trimming or wastage.

6: Limited Availability

X5 paper may not be readily available in all regions or stationery stores due to its relatively niche demand compared to more common sizes like A4 or Letter. However, it can often be custom ordered from specialized printing services.

7: Historical Significance

The introduction of standardized paper sizes like X5 played a crucial role in streamlining international communication and document exchange. It facilitated the development of efficient printing and copying technologies.

8: Paper Weight Considerations

When choosing X5 paper, it is important to consider the appropriate weight or thickness for the intended use. Different weights can affect the durability, print quality, and overall feel of the final product.

9: Environmental Impact

X5 paper, like other paper sizes, can be produced from various sources such as recycled materials or sustainably managed forests. Opting for eco-friendly options helps reduce deforestation and minimizes the carbon footprint associated with paper production.

10: Customization Options

X5 paper can be easily customized with different finishes, coatings, or colors to enhance its visual appeal and suitability for specific applications. This allows for creative flexibility in designing printed materials.