Guild Wars Weapon Damage Calculator

Weapon & Attack Stats
Engine strictly caps at +33% (faster) or -50% (slower).
Attributes & Target
For Caster weapons, this does not affect base damage or crit chance. Adds 1% independent crit chance per rank (typically for Assassins).
Base Damage Multipliers (%)
E.g., Customized (+20%), Slaying (+20%).
Crit Chance Bonus (%)
Independent probability from skills.
Double Strike Bonus (%)
Stacks additively. Applies to Daggers only.
Bonus Armor Penetration (%)
Stacks additively (e.g., Judge's Insight).
Bonus Damage/Life-Stealing
Armor-ignoring damage added per hit.

References & Formula Sources