When it comes to paper size, the U.S. and Canada follow a unique 8.5″ by 11″ format called US Letter. However, everyone else in the world has adopted the A4 format. Which paper size is best? Let’s let math decide.
The two competing formats have different aspect ratios. In most situations, the A4 format allows the convenient printing of multiple images (with the same aspect ratio) on one piece of paper. However, the US Letter format results in wasted space and unwanted image cropping, if you want to print multiple images (with the same aspect ratio) on a piece of paper.