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US Series



Belonging to the ANSI series, the ANSI A paper size stands as a testament to standardization and uniformity in the world of documentation. This particular size, measuring 8.5 x 11 inches, is an integral part of the American National Standards Institute (ANSI) paper sizes.

As a member of this series, ANSI A holds its own unique position. It's not just another paper size; it's the very foundation of the series. The dimensions of all other sizes in this series are derived by either halving or doubling that of ANSI A.

ANSI A 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 significance of ANSI A extends beyond its role within its own series. It also serves as a bridge between two major standards - ISO and ANSI. In fact, it corresponds closely with the international standard 'A4' from ISO 216 series, which measures 8.27 x 11.69 inches.

Despite slight differences in dimensions, these two sizes are often used interchangeably across different regions due to their close proximity in size and widespread acceptance globally.

In essence, whether you're drafting an office memo or printing a personal document, chances are high that you're utilizing an ANSI A sheet - a testament to its ubiquity and universal appeal.

Other Formats in the US Series

Interesting facts about ANSI A

1: ANSI A paper is based on the American National Standards Institute (ANSI) standard.

ANSI A paper is a series of paper sizes that adhere to the standards set by the American National Standards Institute. It is commonly used in North America and has dimensions of 8.5 inches by 11 inches.

2: ANSI A paper is also known as Letter or US Letter size.

The ANSI A paper size is often referred to as "Letter" or "US Letter" size. It gained popularity in the United States and Canada, where it became the standard for various applications, including printing documents, letters, and business correspondence.

3: ANSI A paper was originally derived from British foolscap folio sheets.

The dimensions of ANSI A paper were initially derived from British foolscap folio sheets used during the colonial period. Foolscap folio sheets were approximately 8.5 inches by 13.5 inches, but they were later trimmed down to create a more standardized size for official documents.

4: The aspect ratio of ANSI A paper is approximately √2:1.

The aspect ratio of ANSI A paper (8.5 x 11 inches) is approximately √2:1 (or about 1:1.294). This means that if you divide the longer side by the shorter side, you will get a value close to √2 (approximately 1.414).

5: ANSI A paper can be easily scaled without changing its aspect ratio.

An interesting feature of ANSI A paper is that it can be scaled up or down without altering its original aspect ratio (√2:1). This property allows for easy enlargement or reduction of documents while maintaining the same proportions.

6: ANSI A paper is part of the ANSI/ASME Y14 series.

The ANSI A paper size is part of the larger ANSI/ASME Y14 series, which includes various paper sizes used in engineering and technical drawings. The series ranges from ANSI A to ANSI E, with each size having its own specific dimensions.

7: ANSI A paper is widely compatible with printers and copiers.

Due to its popularity and widespread use, printers and copiers are designed to accommodate ANSI A paper sizes. This makes it convenient for printing documents without requiring custom settings or adjustments on most standard office equipment.

8: The ISO equivalent of ANSI A paper is called "A4."

The International Organization for Standardization (ISO) has its own set of standardized paper sizes. The ISO equivalent of ANSI A paper (8.5 x 11 inches) is known as "A4," which has slightly different dimensions (210 mm by 297 mm).

9: The adoption of ANSI A paper helped streamline document handling processes.

Prior to the adoption of standardized sizes like ANSI A, there was a lack of consistency in document sizes, leading to difficulties in handling and storing papers. The introduction of standard sizes like Letter size helped streamline document management processes across industries.

10: Despite digital advancements, the demand for printed ANSI A documents remains significant.

In today's digital age, where electronic communication prevails, there is still a substantial demand for printed documents on ANSI A-sized papers. This highlights the enduring importance and practicality of physical copies in various professional settings.