AR calculator
Pick a weapon, affinity and upgrade, enter your stats and see the attack rating the game's menu would show, split by damage type and by the stat each part comes from. To compare every weapon at once, rank them all at your stats with best weapons for my stats.
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How attack rating is worked out
Each damage type starts from the weapon's base attack times its upgrade rate. Every stat that scales that type adds base × scaling × curve: scaling is the weapon's value times the upgrade's rate (an affinity can replace it), and the curve is the weapon's scaling graph at your stat. Miss a requirement for a stat that scales a type and that type falls to 60% of its base with no bonus. Two-handing multiplies Strength by 1.5, rounded down; bows always count as two-handed, paired weapons never do. The menu rounds each type down and adds them up. More in the methodology.