![]() ![]() Dimensions of A, B and C series ISO paper sizes in millimetres and in inches SizeĬomparison of A4 (shaded grey) and C4 sizes with some similar paper and photographic paper sizes Each ISO paper size is one half of the area of the next larger size in the same series. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Two supplementary standards, ISO 217 and ISO 269, define related paper sizes the ISO 269 " C" series is commonly listed alongside the A and B sizes.Īll ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √ 2:1, within rounding to millimetres. The standard defines the " A", " B" and " C" series of paper sizes, including A4, the most commonly available paper size worldwide. ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. An A4 paper sheet folded into two A5 size pages ![]()
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