The ISO paper sizes are devised in such a way that each smaller size is exactly half the size of the previous one. Use the sizes in the table below, which are the true ISO cut sheet sizes as a guide. In this example the 'USER' size has been set to A3. If you look at the dialogue box above, you will see that it is possible to enter your own 'USER' paper sizes which can be set as true ISO sizes. Despite this fact, AutoCAD still quotes the plotted area sizes in the plot dialogue box. For example, a true A3 print can be made from an A1 roll. To some extent this issue has been physically resolved by the use of roll feed plotters. See the 'Paper Size' dialogue box on the right. Obviously it is not possible to print right to the edge of cut sheets, so the AutoCAD sizes quoted are always smaller than the true cut sheet size. There has alwas been some confusion over the size of standard ISO drawing sheets with AutoCAD.The stated sizes in the plot dialogue box are not the true ISO sizes, rather they relate to the plotted area on standard size cut sheets.
