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What is the International paper sizes?

Jun 25, 2018

The international paper size standard is ISO 216. Paper size is based on the German DIN 476 standard for paper sizes. 

ISO paper sizes are all based on a single aspect ratio of the square root of 2, or approximately 1:1.4142. There are different series, as well as several extensions.

The international paper sizes are included in Cascading Style Sheets (CSS): A3, A4, A5, B4, B5.