Gold Karat, Purity & Scrap Value Calculator
Calculate fine-gold content for one piece or a mixed lot, convert karat and fineness, and estimate metal value from a price you supply. Keep theoretical metal value separate from an illustrative buyer payout.
Enter your values or load an example. Calculations stay in this browser.
Enter net metal weight
A stone-set ring weighs more than its metal. Exclude gems and other components before entering a net weight. A plated object is not solid gold at its surface karat, so this solid-metal calculation is unsuitable without knowing the actual gold mass.
Convert the purity you have
Karat is expressed out of 24; fineness is expressed out of 1,000. For example, 18 karat corresponds mathematically to 750 fineness. This is a conversion of your supplied purity, not confirmation that a hallmark is accurate.
Use your own price and record its basis
Enter a spot price per gram or fine troy ounce and choose the currency label. A troy ounce is 31.1034768 g and differs from an ordinary avoirdupois ounce. No price or exchange rate is fetched; results use exactly the input you provide.
Separate value from a buying offer
The mixed-lot result totals the gold fraction of each net metal weight. A payout percentage shows an illustrative deduction from that metal value. Testing, refining charges, collectible premiums and the buyer’s terms can change an actual offer.
Sources and methods
Frequently Asked Questions
Does this provide a live gold price?
No. Enter a price you checked and select whether it is per gram or per troy ounce. The calculator does not fetch prices or currency conversions.
Can I combine different karats?
Yes. In mixed-lot mode enter one weight,purity pair per line. Every line shares your chosen mass unit and purity scale.
Is melt value the same as resale value?
No. Metal value excludes workmanship and collectible premiums, and a buyer may deduct costs. It is not an appraisal or guaranteed offer.
Can a photo or hallmark confirm purity?
No. This calculator assumes the purity you enter. Professional testing may be needed to establish actual composition.
Continue in the app
Explore photo identification features in Gold Detector - Goldiva. The calculator above uses only the values you enter.
