How to Understand the Different Paper Sizes

Do you need to have some printing done and are wondering the ideal paper sizes to choose from? The A-Series is an International Standard (ISO 216) and is recognised all over the world. You will find papers in different dimensions from A0 to A10, arranged from the largest and the smallest. Below are some primary A-Series paper sizes.


This is the most common paper size used for technical drawings and posters. It measures 841mm by 1189mm. In inches, this is 33.11 by 46.81 inches. It is the largest paper in the set, and folding it brings the other paper sizes.


You will find this paper size in technical drawings, flip charts, and posters. It measures 594mm by 841mm. In inches, this translates into 23.39 by 33.11 inches. It results from a vertically folded A0 paper size.


This paper size is designed for medium size posters, diagrams, and architectural drawings. It comes in a 420mm by 594mm, and this in inches is 16.54 by 23.39 inches. The paper size is a result of the horizontally folded A1 paper size.


The A3 paper size is mostly seen in drawings, diagrams, and large tables. A graph paper is also a perfect example of an A3 paper. It measures 297mm by 420mm and this in inches is 11.69 by 16.54 inches. An A3 is a result of vertically cutting an A2 paper size.


A4 paper is used for a wide range of documents, including magazines, letters, forms, and catalogues. It measures 210mm by 297mm. This translates into 8.27 by 11.69 inches. It results from vertically folding an A3 paper size into half and can also be used as a graph paper.


This is an ideal size for notepads and pocketbooks. It measures 148mm by 210mm and 5.83 by 8.27 inches. You can get an A5 document by splitting an A4 size.


The paper size is commonly seen in the postcards, toilet paper, small pocketbooks, and other library microfiches. It measures 105mm by 148mm. It is a result of folding an A5 document into two equal horizontal parts.


This size can be seen in tickets and Post-it notes. An A4 sheet produces eight pieces of A7 paper sized documents. It measures 74mm by 105mm and 2.91 by 4.13 inches. An A6 folded twice brings two A7 papers.


The A8 paper size works best for bank cards and driver’s licenses. You will find that sixteen of them fill up on an A4 document. It measures 52mm by 74 mm and 2.05 by 2.91 inches. You can also arrive at the size by dividing an A7 into two.


The paper measures 37mm by 52mm and 1.5 inches by 2.0 inches. It results from folding the A8 paper size.


This paper is the smallest in the A-series and measures 26mm by 37mm and 1.0 and 1.5 inches. You can arrive at this by cutting an A9 paper size into two.


Understanding these paper sizes is not a complicated affair as it involves splitting the previous size by two. With this information, you can comfortably choose your ideal paper sizes for your printing needs. You know what banner to print on a 4A0 paper size and the business card to print on an A7 paper.