Melee Attack

An attack roll represents your attempt to strike your opponent on your turn in a round.

Melee Attack Roll = Base Attack Bonus +Str Mod
Damage Roll = Weapon Dmg Die +Str Mod

Weapon Dmg when Two-Handed = +Str Mod x1.5
[Excluding Light Weapons]^
Off-Hand Weapon Dmg = +Str Mod x0.5

PRPG Core Rulebook pg. 178