We offer many print products, so please visit our Home Page I bet you’ve seen, used, and scribbled on at least one piece of this today! At The Printroom Group, we print on sizes from A5 to A0, both bound and unbound. It is commonly used for letters and correspondence in the UK, and it is the standard paper size for most home printers. To many people worldwide, excluding North America and Canada, the most standard paper size is A4 (a familiar 210mm x 297mm). For example, the length of A4 is 297mm, which is also the width of A3. Remember, the length of the smaller size is always equal to the width of the larger size. A0 halves to become A1, which halves to become A2, all the way down to A10. Starting from A0, all subsequent A paper sizes are determined by halving the paper on its most extended size.
For example, the dimensions of A4 paper are 210x297mm, and half of A4 equals A5, and double A4 equals A3. With A sized paper, however you double the short edge or half the long edge, it will always have the same width to height ratio. The range begins with A10 (37mm x 26mm) and goes all the way through to the “Bus Stop Size” A0 (1189mm x 841mm). What size is A4 paper? And A3 and A5 and A0, for that matter! The most common paper sizes used in the UK for printing and stationery are International Paper Sizes which all begin with the letter A. What Size is A4 Paper? – A Guide to Paper Sizes