What is the most common of print sizes?
Printing paper in US, Canada
In US and Canada the most common printer paper size of most documents is the letter paper size.
Dimensions of Letter size paper for printing is
8.5 × 11 in or 216 × 279 mm.
Printing paper in Europe and rest of the world
In most part of the world the standard paper size for printing is the A4 paper.
Dimensions of the A4 paper for printing is
8.3 × 11.7 in or 210 × 297 mm.