Attack bonus

Your attack bonus with weapons is a combination of:

Base Attack Bonus + ability modifier + weapon's enhancement bonus + other modifiers

Most melee weapons use Strength for calculating attack bonus. With the Weapon Finesse feat, your attack bonus with a light melee weapon, a rapier, or unarmed uses Dexterity. Ranged or thrown weapons use dexterity for calculating attack bonus. With the Brutal Throw feat, your attack bonus with thrown weapons (but NOT ranged weapons) uses strength. Certain weapons use different abilities for calculating attack bonus (e.g., Epic Dynastic Falcata or Staff of Nat Gann). Read more here.

Player's chance to hit an enemy: (Player's Attack Bonus + 10.5) / (Target's Armor Class * 2) + 20% proficiency bonus, rounded to nearest 5%

Common bonuses to hit

• Base Attack Bonus
• Attack sequence bonuses
• Halfling Size Bonus
• Competence bonus (e.g. from Accuracy items)
• Morale bonus (e.g. from bard's Inspire Courage or Good Hope spell)
• Racial weapon enhancements
• Weapon Focus feat
• Action boost bonus
• Airship training dummy bonus
• Named item sets
  • Untyped Bonus (Untyped bonuses stack)
    • Korthos Island item sets
    • Shintao ToD set
    • Fabricator's Ingenuity
    • Wrath of Sora Kell
  • Exceptional Bonus (These may not stack, although there exists no way to test that yet)
    • Kensei, Warpriest ToD sets

Percentage bonuses to hit

• Bonus for being proficient with the weapon (20%)
• Precision feat (5%)
• Elven Accuracy enhancements, available for Elf and various Elven sub-races (up to +6%)
• Defensive Fighting (5% penalty)

Sneak attack bonuses

• Bonuses to hit while sneak attacking stack with universal to-hit bonuses

Common penalties to hit

• Two Weapon Fighting
• Power Attack feat
• Various debuffs (debuffs always stack)

Monster to hit

• A monster's attack bonus is typically equal to 2.5 times their challenge rating. Details here. This may or may not apply to orange, red, and purple named bosses.

See also

• How to Hit Things