how to calculate mages damage

[chete]

Hi all, i'd like to know if any1 knows to calculate the damage a mage can do, i've got this far:

lvl 120 elemental penetration = 1440
for example a +1000 book
thats 2440

lvl 120 elemental resistance = 960 (672 real defense) [ i say real defense coz i calculated for a long time and the defense u get just acts in a 70% to the damage you take, correct me if im wrong].
thats 2440 - (960 * 0.7) = 1768 if u add for example 55% damage from attributes (if ur fighting someone with elemental attributes too, this % would change) = 2740 damage.

so i guess each mage has a % damage influenced by the % hit chance, does any1 know the % damage for each mage?
could it be for example hephaestus 90% hit chance, 90% damage, and then the lower hit chance the higher damage? thunder mage 50% hit chance, 130% damage? its just examples, hope u can help hehe.
if im wrong at any part of the calculation pls tell me