Drawing sheets in current use are sized according to the ISO “A” series. The drawing sheets are not square. The range of preferred sizes of the trimmed sheets selected from the main ISO “A” series are shown below.
| Designation | Dimensions |
| AO | 841 X 1189 |
| A1 | 594 X 841 |
| A2 | 420 X 594 |
| A3 | 297 X 420 |
| A4 | 210 X 297 |
| A5 | 148 X 210 |
| A6 | 105 X 148 |
| A7 | 74 X 105 |
| A8 | 52 X 74 |
| A9 | 37 X 52 |
| A10 | 26 X 37 |
When looking at a diagram showing the relationship of the “A” sizes of drawing sheets, it is clear to see that the
A1 size is half the size of the A0
A2 size is half the size of the A1
A3 size is half the size of the A2 and
A4 size is half the size of the A3.
The A0 size paper is one square meter in area. It lends itself to a paper weight unit GSM (Grams per Square Meter). It is generally expected that a drawing sheet should incorporate a frame or border which encloses the drawing area. The width of the frame should be between 7mm and 20mm, depending on the size of the sheet. The sheet border should be completed with a title block (Click to read more). A title block is positioned at the bottom right hand corner of the frame. Basic information is recorded here such as the drawing date, Scale, drawing number and the drawers name.