In less visual terms, any sheet of A-series paper is as long as the next-larger sheet is wide and half as wide as the next-larger sheet is long. To wit: Sheet name     Width (mm)     Length (mm)      A0     841     1189 A1     594     841 A2     420     594 A3     297     420 A4     210     297 A5     148     210 A6     105     148 A7     74     105 A8     52     75