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International Envelope Series



The R1 paper size, a member of the ISO 216 standard, is a unique and versatile format. It measures 648 x 917 mm or 25.5 x 36.1 inches, making it an ideal choice for various applications.

As part of the ISO's "R" series, R1 stands out due to its distinct dimensions that are not found in the more commonly used "A" or "B" series. This makes it particularly useful for specific projects where traditional sizes may not suffice.

R1 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

Interestingly, the ISO's "R" series was designed with a specific purpose in mind: to accommodate formats that don't fit within the constraints of other series. The R1 size embodies this flexibility perfectly.

Moreover, while ANSI standards are prevalent in North America, ISO standards like R1 are recognized and utilized globally. This international recognition enhances its versatility and applicability across different regions and industries.

Whether you're working on a design project or preparing large-scale prints, consider leveraging the unique attributes of R1 paper size. Its distinctive dimensions coupled with global recognition make it an excellent choice for diverse needs.

Other Formats in the International Envelope Series

Interesting facts about R1

1: R1 paper is part of the ISO 216 standard

R1 paper is a size that belongs to the ISO 216 standard, which is an international system for paper sizes. This standard was first introduced in 1975 and has been widely adopted around the world.

2: R1 paper measures approximately 707 mm x 1000 mm

The dimensions of R1 paper are approximately 707 mm x 1000 mm (27.8 in x 39.4 in). It has a portrait orientation, meaning it is taller than it is wide.

3: R1 paper is commonly used for posters and large format prints

R1 paper's larger size makes it ideal for printing posters, banners, and other large format prints. Its dimensions provide ample space for displaying detailed graphics or text.

4: R1 paper originated from the German DIN standard

The ISO A series of papers, including R1, was derived from the German DIN (Deutsches Institut für Normung) standard introduced in the early twentieth century. The DIN standard aimed to establish a consistent set of paper sizes across Germany.

5: The aspect ratio of R1 paper is approximately √2

The aspect ratio of R1 paper (the ratio between its longer side and shorter side) is approximately √2 (square root of two). This aspect ratio allows easy scaling between different ISO sizes without altering proportions.

6: The weight of R1 paper can vary depending on its thickness

Rather than having a specific weight assigned to it, the weight of R1 paper depends on its thickness or grammage. Common weights for R1 paper range from 80 gsm (grams per square meter) to 300 gsm, with heavier weights being more suitable for durable prints.

7: R1 paper is not commonly found in everyday office use

While R1 paper is widely used in the printing industry, it is not commonly found in everyday office settings. Its larger size makes it less practical for standard office documents and printing needs.

8: R1 paper can be cut down to smaller sizes

If needed, R1 paper can be easily cut down to smaller sizes using a trimmer or cutter. This flexibility allows for customization and adaptation of the paper to specific project requirements.

9: The ISO A series includes larger sizes than R1

The ISO A series of papers extends beyond the size of R1, with larger formats such as A0, A1, and A2 available. These larger sizes are often used for architectural drawings or other specialized applications.

10: The ISO B series complements the ISO A series

In addition to the ISO A series, there is also an ISO B series that complements it. The B series has different dimensions but maintains the same aspect ratio as its corresponding A size. This allows for easy scaling between both series when necessary.