Your figuring may well be wrong, convertibility is as much, or more, a function of structure and complexity as it is size.
The difficulty with dictionaries and bibles is that they have lots of internal linkages that have to mapped. That may not be true of your calculus book, if the presumably large number of equations are laid out as images that may account for its size.
What format are Amazon shipping? It could be that it is already a PDF in a proprietary Amazon DRM infested wrapper. Have you looked elsewhere for the book? Did you check the publisher's site.
BR
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