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, different sources of bullet lifesteal stack multiplicatively, not additively. With $n$ different sources of bullet lifesteal, final bullet lifesteal $B L_{F}$ is given by:

$B L_{F} = 1 - \prod_{i = 1}^{n} (1 - B L_{i})$

where $B L_{i}$ is the bullet lifesteal provided by the $i$ th source.

Example

With 10% Bullet Lifesteal from Crippling Headshot and 35% Bullet Lifesteal from Leech, final bullet lifesteal is:

$B L_{F} = 1 - (1 - 0.10) \times (1 - 0.35) = 41.5 %$

Note that the in-game user interface is inconsistent in how it rounds the final number.

Sources

List of items
Name	Cost	Category	Stat change
Active Reload	1,250	Weapon	+18% Bullet Lifesteal
Heroic Aura	3,000	Weapon	+16% Bullet Lifesteal
Crippling Headshot	6,000	Weapon	+10% Bullet Lifesteal
Vampiric Burst	6,000	Weapon	+80% Bullet Lifesteal
Bullet Lifesteal	1,250	Vitality	+24% Bullet Lifesteal
Leech	7,250	Vitality	+32% Bullet Lifesteal