How are attributes allocated?
The best answer that I can find is lacking a few specifics: Percentage life vs vitality?
Given I'm concerned only with total vitality, rather than the tradeoffs %Life and Vit, I've opened a new question. Namely, is a constant in the previous question that is not explained, that I assume are a function of character level. The previous page does also not account for paragon levels.
For reference, the answered formula should use the following parameters to give a total vitality of
1023 Vit from gear, level
34 paragon, level
10 % Life increase. Using the referenced formula I've added a term for 2 vit per level of paragon.
Total Vit = (127 + GearVitality + 2 * ParagonLvl)