Attack Bonus

Your attack bonus with a melee weapon is:

Base attack bonus + Strength modifier + size modifier

With a ranged weapon, your attack bonus is:

Base attack bonus + Dexterity modifier + size modifier + range penalty

Table: Size Modifiers
Size Size Modifier Size Size Modifier
Colossal –8 Small +1
Gargantuan –4 Tiny +2
Huge –2 Diminutive +4
Large –1 Fine +8
Medium +0