Book page word counts can vary wildly depending on so many factors—font size, margins, genre, even the era it was published. I recently compared my paperback copy of 'The Hobbit' to a modern thriller, and the difference was staggering. Tolkien's classic uses smaller type and denser paragraphs, packing around 350–400 words per page, while the thriller had generous spacing and maybe 250–300. Classic literature tends to be denser, partly because paper was costlier back then. Graphic design choices also play a role; poetry collections might have 50 words per page with intentional white space, while epic fantasy doorstoppers squeeze in every possible word to avoid splitting volumes.
Something fascinating I noticed is how ebooks disrupt this entirely. My Kindle adjusts word count based on font settings, so 'page' becomes meaningless. Physical books at least force consistency within an edition. For writers, this variability is crucial—agents often cite 80k–100k words as a sweet spot for debut novels, but that translates to 300 pages in one format or 500 in another. It’s why I always check word counts, not page numbers, when judging a book’s length.