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By 1977, A4 was the standard letter format in 88 of 148 countries. Today the standard has been adopted by all countries in the world except the United States and Canada. In Mexico, Costa Rica, Colombia, Venezuela, Chile, and the Philippines, the US letter format is still in common use, despite their official adoption of the ISO standard.
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, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". [2]
[citation needed] A4 ("metric") paper is easier to obtain in the US than US letter can be had elsewhere. [ citation needed ] . The ISO 216:2007 is the current international standard for paper sizes , including writing papers and some types of printing papers.
Similarly, two sheets of A4 can be scaled down to fit one A4 sheet without excess empty paper. This system also simplifies calculating the weight of paper. Under ISO 536 , paper's grammage is defined as a sheet's mass in grams (g) per area in square metres (unit symbol g/m 2 ; the nonstandard abbreviation "gsm" is also used). [ 5 ]
Note: 279.4 mm is the length of a 'Letter' sized paper. For A4 the length is 297 mm This media should work for many people with some kind of color (blindness) deficiency .
A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".
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See Paper size: North American paper sizes and A4 paper in the United States. The most common US paper size is Letter (I think), which is 5.9 mm wider and 17.6 mm less tall. This might seem a small difference, but it causes problems when trying to scale documents, or when trying to fit e.g. A4 paper in a filing cabinet designed for Letter.