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The standard for drawing sheet sizes is the A series. The basic size in this series is the A0 size (1189mm x 841mm) which has an area of about 1m3. The sides of every size in the series are in the ratio Sqrt(2) = 1.414 : 1 and each size is half the area of the next larger size.
Drawing Sheet Size  Size in millimetres  Size in inches 
A0  1189 x 841  46.81 x 33.11 
A1  841 x 594  33.11 x 23.39 
A2  594 x 420  23.39 x 16.55 
A3  420 x 297  16.55 x 11.69 
A4  297 x 210  11.69 x 8.27 
A5  210 x 148  8.27 x 5.84 
A6  148 x 105  5.84 x 4.13 
Preferred Scales For Drawings...
The preferred scales are
1:1, 1:2, 1:5, 1:10, 1:20, 1:50, 1:100
Designation  Trimmed Sheet  Drawing Space +/ 0.5mm  Untrimmed sheet +/ 2mm  
  Width (mm)  Length (mm)  Width (mm)  Length (mm)  Width (mm)  Length (mm) 
A0  841  1189  821  1159  880  1230 
A1  594  841  574  811  625  880 
A2  420  594  400  564  450  625 
A3  297  420  277  390  330  450 
A4  210  297  180  277  240  330 
Useful Links On Drawing Sheet Sizes
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Last Updated 25/12/2010