It is actually **lighter** and less bulky to have it in printed form than to carry around an expensive calculator.
However....My homeschooled Saxon Math kids used a calculator for Algebra 2 and above. Two went on to graduate from college at the age of 18 with B.S. degrees in ....( drum-roll!).....MATHEMATICS! ( Yeah!) All three finished Calculus 3 at the community college by the age of 15.
Depends on how many decimal points of accuracy you want, and which functions. :) I have these books on my shelf, as they were part of every mechanical engineer’s tools of the trade decades ago. Once the slide rule was superceded by the electronic calculator there was no more need for books of tables.