ISO Paper Sizes Explained (What is A4, B4 etc sizes?)

Let’s take a look at how ISO defines standard for paper sizes such as the popular A4 size. How are these sizes defined and how it works? What is the aspect ratio crucial to the standard? What are the width and height of these sizes?


A4 is perhaps the most widely used standard paper size in the world. But what do we actually mean when we say a paper is of A4 or A3 size? This and more explained in this video that discusses the ISO standard paper sizes as defined in the ISO 216 standard.


0:00 ISO Paper Sizes Explained
1:35 How are paper sizes like A4 named?
2:23 Aspect ratio of ISO paper sizes
4:13 ISO A Series paper sizes
6:02 ISO B Series paper sizes
7:38 ISO C Series paper sizes



For size tables and reference diagrams for all series:
https://www.whatium.com/iso-paper-siz...

Usage map used
https://commons.wikimedia.org/wiki/Fi...

By-Crissov, CC BY-SA 4.0
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