A4 vs US Letter: logic behind the sizes
I read a very informational article on the differences between and the logic behind A4 and US Letter paper sizes. The A series of paper is based on the ratio of 1:sqrt(2), or 1:1.414, as a paper with dimensions of that ratio can be folded in half length-wise and the resulting size retains the ratio. The US series does not keep its ratio, but skips between sizes.
From TFA:
Which raises the question, why the difference at all? If both sizes are arbitrary, why bother with maintaining a difference. The answers are long and involved, and mostly outside the scope of this article. At the core, however, it comes down to one thing: A4 isn’t an arbitrary size.
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