Paper size - Wikipedia
https://en.wikipedia.org/wiki/Paper_size
OverviewInternational standard paper sizes Transitional paper sizesNorth American paper sizesTraditional French paper sizesNewspaper sizesSee alsoFurther readingThe international paper size standard is ISO 216. It is based on the German DIN 476 standard for paper sizes. Each ISO paper size is one half of the area of the next larger size in the same series. ISO paper sizes are all based on a single aspect ratio of the square root of 2, or approximately 1:1.41421. There are different series, as well as several extensions.
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