This has 2 benefits (apart from being easy to remember) the first is that if you fold or cut a sheet of A3 in half you will get a finished size of A4. What makes this system so clever is that all the paper sizes have the same proportions with the longest side being half the length of the shortest side on the next size of paper down. As the ‘A’ number goes down the sheet size goes up with measurements given in millimetres. The ‘A’ series which includes A4 (the standard size for a letterhead) is the most commonly known and widely used ISO standard. Whilst you can effectively have any size you want within reason, in the print industry the most common system uses the ISO standard for paper sizes. I am often asked what size can we print a job. This gives an A3 sheet the flat size equivalent of exactly 2 A4 sheets. So for instance an A4 sheet measures 210mm x 297mm making its shortest edge 210mm long. Ok that’s great so you know roughly how big an A4 is so what about the rest? Well if you are going up by 1 size from A4 to A3 (The lower the number the larger the sheet) you double the size of the shortest edge. It is likely the size of paper you printer uses, the size of letters you get in the post and pretty much the most commonly used size of paper on the planet. I am sure you are already familiar with A4. The naming convention for this series is simple, it uses the letter A followed by a number. For most people knowledge of this group alone is sufficient. Standardised by ISO 216 this is group of paper sizes you will most likely already be familiar with. I will start with the most common paper size group, the A series. Once you know what they mean however and how they relate to one another you will be relieved to know it all becomes rather simple. On the surface of it paper sizes can be a little bewildering all these seemingly unrelated letters and numbers that mean nothing to the uniformed eye.
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