This is taken from Things you SHOULD know about Diablo 2Do you get a bonus from having CTA if you go for +life charms and put your points into strength/dex for equipment? Or would you end up with more life by getting strength/dex charms and pumping vita?
So basically you want as much str and dex on your equipment as possible, allowing you to put more points into vit and use more life charms.47. What kinds of life bonuses are affected by Battle Orders?
If you are asking this sort of a question, you have probably heard that not all life is multiplied by Battle Orders and other percentage-based life boosters. This is true.
When it comes to calculating your final life, there are effectively three factors you need to consider. These factors could be called "Boostable life", "Non-boostable life" and "Percentage boosts".
# Boostable life is life gained from spent vitality points, life naturally gained per level up, +life bonuses on items, and life gained from quest rewards.
# Non-boostable life is life gained from "soft" vitality points on items, life gained from life per level bonuses on items and life gained from vitality per level bonuses on items.
# Percentage boosts are the life% bonuses that can (for examples) be seen on the skills Battle Orders, Oak Sage or Lycanthropy, and items such as Doombringer or Jah runes in armor.
For the actual calculation, add together all your boostable life sources, and calculate your life. Then add together all percentage boosts to form a single percentage, and apply it as a bonus to your boostable life. After that, add the non-boostable life.
This information would be best displayed by an equation:
Final life = Boostable_Life * (100% + Boost%)/100% + nonboostable_Life
Mana calculations follow the same equation and mechanics.