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I’ve always worked on the basis that my base text is going to be a paragraph…and that would be 1 rem…and I start at 16px.

Anything above that would be a heading of some kind and so would be larger so a multiple (1.5 or whatever of rem).

I’m unlikely to go much below an h3 so it’s not a huge issue….however, if I really need small text I can set 0.5 rem or whatever.

I don’t worry about calculating exact pixel values, and 16 divides many ways by 2, 4, 8 etc.

It’s a matter of choice really, you’re really only going to define the base setting once (most of the time) so how you do it is up to you.

Do decimal values really matter?