* No Centralized Tracking: There's no global organization that tracks book sales across all publishers and languages.
* Various Editions: Dracula has been published in countless editions, translations, and formats over the years.
* Digital Sales: E-books and audiobooks are difficult to track accurately.
* Historical Sales: Sales data from early editions is often incomplete or unavailable.
However, we can say that Dracula is one of the best-selling novels of all time. It's been continuously in print since its initial publication in 1897 and has been adapted numerous times for film, television, theatre, and other media. It's a classic that continues to resonate with readers today.