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B Series



Belonging to the ISO 216 series, B1+ is a unique paper size that stands out in its class. This international standard, adopted by countries worldwide except for the United States and Canada, which use the ANSI series, has been instrumental in streamlining printing and documentation processes.

The dimensions of B1+ paper size are 720 x 1020 mm or 28.3 x 40.2 inches. This makes it larger than the standard B1 size of 707 x 1000 mm or approximately 27.8 x 39.4 inches. The "+" denotes this slight increase in dimensions, providing additional space for bleed during printing - a crucial factor for professional printers and graphic designers.

B1+ paper dimensions


View All B 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, like other sizes in the ISO series, B1+ adheres to an aspect ratio of √2:1 - a unique feature that maintains the aspect ratio even when scaled up or down. This means if you fold a B1+ sheet in half along its longest side, you'll get two sheets of the next size down (B2), while maintaining the same aspect ratio.

In practical applications, B1+ is commonly used for large-scale prints such as posters and banners due to its generous dimensions. It's also favored by publishers for oversized books and magazines where visual impact is paramount.

With its unique features and practical applications across various industries, B1+ holds an important position within the ISO paper size system.

Other Formats in the B Series

Interesting facts about B1+

1: B1+ Paper Size

B1+ paper is part of the ISO 216 standard, which defines the sizes of paper used globally. It measures 707 x 1000 millimeters (27.8 x 39.4 inches) and falls between B1 and A0 in size.

2: Origin of ISO Paper Sizes

The ISO paper size system was first introduced in Germany in the early 20th century by Dr. Walter Porstmann, who proposed a series of paper sizes based on mathematical principles to ensure consistent proportions.

3: Proportional Scaling

The ISO paper sizes are designed to have a consistent aspect ratio when scaled up or down. Each size is exactly half the area of the next larger size, maintaining a ratio of √2 (approximately 1:1.414).

4: B Series Paper Sizes

The B series is primarily used for posters, wall charts, and oversized prints. The B sizes range from B10 (the smallest) to B0 (the largest), with each subsequent size doubling the area of its predecessor.

5: Common Applications for B1+ Paper

B1+ paper is often used for large-scale advertising displays, architectural plans, engineering drawings, and artwork prints that require ample space without being excessively large.

6: Compatibility with A Series Sizes

B1+ paper can be easily derived from A series sizes by folding an A0 sheet in half twice along its shorter edge. This folding process results in four equal-sized sheets measuring approximately B2 each.

7: Variations Across Countries

While ISO 216 is widely adopted, some countries have their own traditional paper sizes. For example, the United States commonly uses Letter (8.5 x 11 inches) and Tabloid (11 x 17 inches) sizes instead of A and B series.

8: B1+ Paper Weight

The weight of B1+ paper can vary depending on its intended use. It is available in various thicknesses, typically ranging from lightweight options suitable for posters to heavier weights suitable for architectural plans.

9: Environmental Considerations

When choosing B1+ paper or any other type of paper, it's important to consider its environmental impact. Opting for recycled or sustainably sourced papers helps reduce deforestation and promotes eco-friendly practices.

10: Historical Significance

Paper has been used as a medium for communication and record-keeping for over two thousand years. Its invention in ancient China revolutionized human civilization by enabling the spread of knowledge and ideas.