Letter is 216 × 279 mm
A4 is 210 × 297 mm
A4 is an ISO Standard Paper Size that is designed with the height-to-width ratio of the square root of two, a rather nice mathematical expression with some obvious advantages. You can read all about it here . It's also quite interesting to know that we Canadians simply adopted the rather obscure American paper sizes by rounding them to the nearest half centimeter (pretty lame) and that North Americans, in general, are the only ones not using the ISO paper sizes.
BTW: ISO A6 is toilet paper size in Europe. Imagine a world without standards.
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