SRD:Attack Roll

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Attack Roll

An attack roll represents your attempt to strike your opponent on your turn in a round. When you make an attack roll, you roll a d20 and add your attack bonus. (Other modifiers may also apply to this roll.) If your result equals or beats the target’s Armor Class, you hit and deal damage.

Automatic Misses and Hits

A natural 1 (the d20 comes up 1) on an attack roll is always a miss. A natural 20 (the d20 comes up 20) is always a hit. A natural 20 is also a threat—a possible critical hit.

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

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