Posters Posters Posters surround us ­ on billboards, buses and taxis, they are endemic to the urban environment. Shown are the common standard and large poster sizes. Posters are divided into two main categories. Those that are relatively small in format are, in Europe, taken from the ISO A series (a series of sizes from postcard and writing sizes, through to small poster sizes). Paper sizes are as shown below: A series paper sizes H x W A8 A6 A7 (shown in mm and then inches as this series A4 A5 Letter Legal is based upon a metric measurement) 4A0 2A0 A0 A1 A2 A3 A4 A5 2378 x 1682 mm 1682 x 1189 mm 1189 x 841 mm 841 x 594 mm 594 x 420 mm 420 x 297 mm 297 x 210 mm 210 x 148.5 mm 148.5 x 105 mm 105 x 74 mm 74 x 52 mm 52 x 37 mm 37 x 26 mm 93.6 x 66.2 in 66.2 x 46.8 in 46.8 x 33.1 in 33.1 x 23.4 in 23.4 x 16.5 in 16.5 x 11.7 in 11.7 x 8.3 in 8.3 x 5.8 in 5.8 x 4.1 in 4.1 x. 2.9 in 2.9 x 2.0 in 2.0 x 1.5 in 1.5 x 1.0 in A2 A3 AO O A1 A6 A7 A8 A9 A10 US paper sizes H x W (shown in mm and then inches as this series is based upon a metric measurement) Letter Legal Ledger 216 x 279 mm 216 x 356 mm 279 x 432 mm 8.5 x 11 in 8.5 x 14 in 11 x 17 in 13 x 19 in Super A3 330 x 483 mm