The most common paper size used in English speaking countries around the world is A4, which is 210mm × 297mm (8.27 inches × 11.7 inches). The largest sheet from the A series is the A0 size of paper. It has an area of 1m2, and the dimensions are 841mm × 1189mm. The A series uses an aspect ratio of 1:√2, and other sizes in the series are ...