Originally Posted by meeera
They're not exactly arbitrary page numbers, they're page numbers based on an ADE definition of a "page" in a reflowable epub ebook being 1024 btyes. (Everyone uses a different font, font size, margin, etc - we have to agree on what constitutes a "page" somehow.)
Why not just use the ADE method? It doesn't change with different fonts, different margins, different font sizes, etc. It's a good method. It's not perfect, but it works.