StarCraft – Unit Sizes & Damage

Units in Starcraft are one of three different sizes: small, medium and large. The size of a unit is taken
into account when calculating the effects of different classes of damage. This is why, for example, a Firebat
is very effective against Marines, but has a minimal effect on Siege Tanks.
The damage classes and their effectiveness in relation to the three unit sizes are as follows:

  • Normal weapons are equally effective against all types of units.
  • Concussion/Plasma weapons do 50% damage against Medium units and 25% against Large units.
  • Explosive weapons do 50% damage against Small units and 75% against Medium units.

Protoss shields always take full damage from all attacks. Buildings are considered “Large” units.

Some attacks, such as the Scarab explosion, also do “splash damage”, which means that any units or
buildings within a short radius of the attack point will take a peripheral amount of damage.

The following table lists each unit’s size and damage type:

Terran Units
Ground Attack
Air Attack
SCV Small Normal
Marine Small Normal Normal
Firebat Small Concussive+
Ghost Small Concussive Concussive
Vulture Medium Concussive
Siege Tank – Tank Large Explosive
Siege Tank – Siege Large Explosive*
Goliath Large Normal Explosive
Wraith Large Normal Explosive
Dropship Large
Science Vessel Large
Battlecruiser Large Normal Normal
Medic Small
Valkyrie Large Explosive+

Zerg Units
Ground Attack
Air Attack
Larva Small
Drone Small Normal
Zergling Small Normal
Hydralisk Medium Explosive Explosive
Ultralisk Large Normal
Infested Terran Small Normal*
Broodling Small Normal
Defiler Medium
Queen Medium
Overlord Large
Scourge Small Normal
Mutalisk Small Normal Normal
Guardian Large Normal
Lurker Medium Normal+
Devourer Large Explosive

Protoss Units
Ground Attack
Air Attack
Probe Small Normal
Zealot Small Normal
Dragoon Large Explosive Explosive
High Templar Small
Archon Large Normal+ Normal+
Reaver Large Normal+
Shuttle Large
Observer Small
Scout Large Normal Explosive
Carrier Large
Interceptor Small Normal Normal
Arbiter Large Explosive Explosive
Dark Archon Large
Dark Templar Small Normal
Corsair Medium Explosive+

Units in red are Brood War units.

* Weapon does splash damage to all units
+ Weapon does friendly splash damage (meaning it will hit allies and enemy units but not your own)

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