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Photographic Series



Belonging to the ISO A series, the 24R paper size is a unique and versatile format. This specific size, measuring 610 x 914 mm or approximately 24 x 36 inches, is part of the larger ISO standard that governs paper sizes worldwide. The 'R' in its name stands for 'RA', indicating that it's part of the RA subset within the A series.

The ISO standards are designed to ensure consistency and compatibility across different regions and industries. The dimensions of each size in the A series are determined by halving the preceding size along its larger dimension, creating a set of sizes that scale neatly with each other.

24R 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, despite being part of an international standard, the use of 24R paper is not as widespread as some other sizes in the A series. It's often used for technical drawings or large-format printing applications where precision and clarity are paramount.

One notable feature about this particular paper size is its aspect ratio. Like all sizes in the ISO A series, it has an aspect ratio of √2:1. This unique property means that when you fold or cut a sheet in half along its longer side, you get two smaller sheets with exactly same aspect ratio as before.

While not as commonly used as some other formats like A4 or Letter-size papers from ANSI series, 24R holds its own unique place within global standards for paper sizing. Its specific dimensions make it ideal for certain specialized applications where larger format printing is required.

Other Formats in the Photographic Series

Interesting facts about 24R

1. The Origin of 24R Paper

24R paper is part of the ISO 216 international paper size standard, which was first introduced in Europe in the 19th century. It is derived from the A series and is commonly used for printing photographs and posters.

2. Dimensions of 24R Paper

The dimensions of 24R paper are 609.6 mm x 914.4 mm or approximately 24 inches x 36 inches. This makes it a versatile choice for large-format printing projects.

3. Similarity to Arch E Paper

In North America, the dimensions of 24R paper closely resemble those of Arch E paper, which measures about 609.6 mm x 914.4 mm or approximately 30 inches x 42 inches.

4. Common Use in Photography

Due to its large size, many professional photographers prefer using 24R paper for printing high-quality photographs and displaying them as wall art or exhibition prints.

5. Availability in Different Weights

Like other types of paper, you can find various weights (thicknesses) of the 24R size, ranging from lightweight options suitable for framing to heavier options that provide durability and longevity.

6. Compatibility with Large-Format Printers

The dimensions of the 24R paper make it compatible with most large-format printers commonly used in professional printing shops, allowing for easy production without requiring custom sizes or cuts.

7. International Recognition

The ISO standardization ensures that the use of A series papers like the one containing the size equivalent to today's known as "24R" is recognized globally, making it easier for businesses and individuals to communicate their printing requirements across borders.

8. Versatility in Design Projects

Designers often choose 24R paper for creating large-scale graphic designs, such as posters, banners, and architectural plans. Its ample space allows for detailed illustrations and text.

9. Historical Evolution of Paper Sizes

The development of paper sizes can be traced back to ancient China, where the first standardized paper size was established during the Han Dynasty (206 BC – 220 AD). This eventually influenced the evolution of paper sizes worldwide.

10. The Golden Ratio Connection

The ISO 216 standard used to determine paper sizes is based on the concept of the golden ratio, a mathematical proportion that is aesthetically pleasing to the human eye. This ratio ensures that each subsequent size in the series maintains consistent proportions when halved or doubled.