Calculate nominal fine-gold content using documented precious-metal weight conversions and either karat or millesimal fineness.
NIST precious-metals conversion guidance gives one troy ounce as 31.1034768 grams, one pennyweight as 1.55517384 grams, and 480 grains per troy ounce. Karat mode calculates nominal gold fraction as karat divided by 24; fineness mode divides the entered fineness by 1000.
This is a mathematical estimate of nominal fine-gold content, not an assay or jewelry appraisal.
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