Just found that answer and I would like to clarify one small point.
There is no multiplication on critical
Really, that sounds strange but that is true:
Critical ADDs roll-damages. A GreatAxe 3x means, when critical is confirmed, grant the character two additional damage dice. In each roll, all the damage modifier should be added with two exceptions: anything that adds a die or precision damage.
Let us consider a critical hit for Power Sneak Attack with Flaming Greataxe +1
- First roll damage: 1d12 + sneak attack + flaming + magic enhancement + power attack + strength modifier
- Second and third roll damage: 1d12 + magic enhancement + power attack + strength modifier
Notice: power attack on 2h weapon is 3 * (1 + round(BAB/4)). Normally it would be only 2 * (1 + round(BAB/4).
Sure, your 3rd Grade teacher would be happy if you can group everything:
- Total damage: 3d12 + sneak attack + flaming + 3*(magic enhancement + power attack + strength modifier)
yes, for most of the cases, Critical 3x can be translated to multiplier factor somehow. But, if there is another multiplier it would not be the case anymore. Classical example: Mounted Spirited Charge Lance Critical.