A10 is the smallest sheet size measuring 26mm x 37mm. The A0 sheet is the largest sheet in the series, and it is exactly 1m2 of paper measuring 841mm x 1189mm. A-Series PaperĪ-Series paper is the most commonly used around the world and was adopted in Europe in the 19th century. What this essentially means is that if you cut an A3 sheet of paper in half, parallel to its smaller side, you will end up with 2 sheets of A4 paper. This paper aspect ratio was suggested way back in 1786! ISO decides the dimensions of paper sizes based on an aspect ratio of one to the square root of 2 because it gives the perfect scaling. Papers are categorised as A, B, C and DL sizes. The ISO216 system is a metric system and paper sizes are referred to in millimetres. This system is used throughout the world, except in the USA and Canada where paper sizes are decided by the American National Standards Institute, referred to as ANSI. By 1975, so many countries were using the DIN system that it was then established as the ISO standard. The ISO standard was based on a German system known as a DIN standard. ISO stands for International Standards Organisation. In Australia, we use the international paper size standard which is also referred to as ISO216. Here’s a paper size guide to help you wrap your head around the different concepts. However, understanding paper sizes and the related terminology can be a bit confusing. As scrapbookers, card makers and crafters, we are constantly working with paper and cardstock.
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