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.
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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.