Letter or ANSI Letter is a paper size standard defined by the

American National Standards Institute The American National Standards Institute (ANSI ) is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States. The organi ...

, commonly used as home or office stationery in the United States, Canada, Chile,

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, Mexico, Panama,

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, the Dominican Republic and the Philippines. It measures and is similar in use to the A4 paper standard used by most other countries, defined in

ISO 216 ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, including A4, the most commonly available paper size ...

by the International Organization for Standardization.

Details

The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" ''Government Letter'' size, (aspect ratio: 1.3125), was used in government, while paper was standard in most other offices. The aspect ratio is ≈ 1.294 and the diagonal is () in length. In the US, paper density is usually measured in "pound per reams" (of 500 sheets). Typical Letter paper has a basis weight of paper of – the weight of 500 sheets (a ream) of paper at and at 50% humidity. One ream of 20-pound Letter-sized paper weighs , and a single Letter-sized sheet of 20-pound paper weighs , which is equivalent to 75.19 g/m². Some metric information is typically included on American ream packaging. For example, 20-pound paper is also labeled as 75 g/m². The most common density of A4 paper is 80 g/m². The related paper size known as half letter, statement, or organizer L is exactly one half of the US Letter size: (8.5 × 5.5 in).

History

The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual

papermaking Papermaking is the manufacture of paper and cardboard, which are used widely for printing, writing, and packaging, among many other purposes. Today almost all paper is made using industrial machinery, while handmade paper survives as a speciali ...

, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". The letter size falls within the range of the historical quarto size, which since pre-modern times refers to page sizes of wide and high, and it is indeed almost exactly one quarter of the old Imperial (British) paper size known as ''demy quarto'' – – allowing a for trimming.

References

{{Reflist Mechanical standards Stationery

Details

History

See also

References