Is there a standardized size for Books?

Question

I noticed that my softcover/paperback books are all roughly the same size, but have slight differences.Are there standardized sizes (and are they different between US and Europe, just as US Letter and Din A4 are different?) or does each publisher decide it's own size?**Edit:** I'm sorry, I don't mean Number of Pages, I mean physical Page Size/Dimensions :)

Answer 1

Quite an interesting question, but no — books are not required to be a particular dimension. There are no dimension standards for books. However, academic textbooks do tend to be the same dimensions regarding height and width of the cover, back, and binders. Nevertheless, there is no “rule” for that.