Letter (paper size)

Letter paper tiled with almost equilateral triangles. (Perfectly equilateral triangles require the aspect ratio to be 3⁄4√3 ≈ 1.299.)
A Letter-size page
Comparison of Letter (shaded light blue) and Government letter sizes with some similar paper and photographic paper sizes

Letter (officially ANSI A) is a paper size standard defined in ANSI/ASME Y14.1 by the American National Standards Institute, commonly used as home or office stationery primarily in the United States, Canada, and the Philippines, and variably across Latin America. It measures 8.5 by 11 inches (215.9 by 279.4 mm) and is similar in use to the A4 paper standard at 210 mm × 297 mm (8.27 in × 11.7 in) used by most other countries, defined in ISO 216 by the International Organization for Standardization.

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