Bullet Lifesteal

This article is about the stat. For the item, see Bullet Lifesteal (item).

Bullet Lifesteal is a stat that causes a percentage of bullet damage dealt to be regained as health.

Math

Despite being presented in-game as +X% Bullet Lifesteal, multiple sources of bullet lifesteal stack multiplicatively, not additively.

The formula for bullet lifesteal is: $BL_{f}=1-\prod _{i=1}^{n}(1-BL_{i})$
where:
${\begin{aligned}n&={\text{number of bullet lifesteal sources,}}\\BL_{i}&={\text{initial bullet lifesteal,}}\\BL_{f}&={\text{final bullet lifesteal}}\end{aligned}}$

For example, with 10% Bullet Lifesteal from Crippling Headshot and 35% Bullet Lifesteal from Leech, total bullet lifesteal is:

$BL_{f}=1-(1-0.10)\times (1-0.35)=41.5\%\approx 41\%$

Sources

List of items

Name	Cost	Category	Stat change
Active Reload	1,250	Weapon	+20% Bullet Lifesteal
Heroic Aura	3,000	Weapon	+20% Bullet Lifesteal
Crippling Headshot	6,200	Weapon	+10% Bullet Lifesteal
Vampiric Burst	6,200	Weapon	+100% Bullet Lifesteal
Bullet Lifesteal	1,250	Vitality	+28% Bullet Lifesteal
Leech	6,200	Vitality	+35% Bullet Lifesteal