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International Envelope Series



Belonging to the ISO 216 standard, B5 is a versatile paper size that holds significant relevance in various professional and personal contexts. With dimensions of 176mm x 250mm or 6.93 x 9.84 inches, it strikes a balance between compactness and ample space for content.

As part of the B series in the ISO classification, B5 is designed to bridge the gap between A4 and A5 sizes. This unique positioning makes it an ideal choice for publications such as books, notebooks, and diaries that require more room than an A5 but less bulk than an A4.

B5 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

The B series' ingenious design principle ensures that when a B5 sheet is cut in half, it results in two smaller sheets of equal size - precisely matching the dimensions of a B6 paper. This scalability contributes to its popularity across different applications.

In contrast to ANSI standards predominantly used in North America, ISO's international acceptance gives B5 a global presence. From academic journals in Europe to manga publications in Japan, its usage spans continents and industries.

Beyond its physical attributes, what sets B5 apart is its adaptability. Whether you're drafting an internal memo or designing a brochure, this paper size can accommodate diverse needs while maintaining readability and aesthetic appeal.

With its strategic dimensions and universal acceptance under ISO standards, the B5 paper size offers both practicality and versatility - making it an indispensable tool for effective communication across various mediums.

Other Formats in the International Envelope Series

Interesting facts about B5

B5 Paper: Weird and Interesting Facts

1. B5 paper is part of the ISO 216 standard, which defines the A, B, and C series of paper sizes.

2. The dimensions of B5 paper are 176 x 250 millimeters or approximately 6.9 x 9.8 inches.

3. The B series sizes are derived from the A series sizes by halving the longer side of each sheet.

4. B5 paper is commonly used for books, magazines, catalogs, and other printed materials that require a slightly larger format than A5 but smaller than A4.

5. Despite being widely used in many countries around the world, B5 paper is not as well-known or commonly used as its counterparts in the A series.

6. In Japan, B5 size is often referred to as "junior size" due to its popularity in school notebooks and educational materials for younger students.

7. The aspect ratio of B5 paper is approximately 1:√2 (√2 being an irrational number), which means that when you fold a sheet in half along its longer side, you get two smaller sheets with the same proportions.

8. The origins of ISO 216 standard can be traced back to Germany in the early 20th century when Dr. Walter Porstmann proposed a system based on mathematical principles to simplify paper sizes and reduce waste during printing processes.

9. Before the adoption of international standards like ISO 216, different countries had their own unique paper sizes and systems which made it difficult for global communication and printing industries to operate efficiently.

10. The introduction of standardized paper sizes has greatly facilitated international trade, document exchange, and printing practices, leading to cost savings and improved compatibility between different devices and software.