Life stolen pr hit.

[kwfp]

Can anyone tell me where I can find information about how its calculated?

Thank you!

[Omikron8]

it takes a % of the final (after all your bonuses and all the enemy's defenses such as damage reduction or difficulty leech penalties) damage you do to the enemy and gives it to you as life, assuming that the damage of this hit was less than the remaining hitpoints of the monster

for example if you took a high level barb with 5% mana leech into normal blood moor you would leech pretty much nothing because they only have a few hitpoints

[Nimbostratus]

It's basically
physical damage taken by enemy * life steal % * enemy's drain effectiveness.

So if you have 5% life steal and attack an enemy in normal difficulty that has 33% drain effectiveness and no physical resistance with a skill that does 450 physical damage, the resulting gain would be:
450 * 0.05 * 0.33 = 7.4 life.

-Leech is also cut in nightmare and hell. 1/2 and 1/4 if I remember correctly.
-Only physical damage can leech.
-Physical spells such as tornado cannot leech.
-Crushing Blow and Open Wounds don't leech.
-Life Tap's 50% LL ignores drain effectiveness.