Scrap Gold Calculator

To determine how much your scrap gold is worth, the calculator uses three fundamental mathematical steps. First, it converts the item's karat rating into a decimal purity fraction using the formula gold_purity = karat / 24, since 24-karat represents 100% pure gold. Next, it computes the absolute mass of pure gold present in your item by multiplying the total mass by this purity fraction: pure_gold_weight = mass * gold_purity. Finally, it multiplies your pure gold weight by the current market spot price per ounce to establish the baseline valuation: price = price_per_ounce * pure_gold_weight.

Imagine you have a broken 14-karat gold chain weighing 15 grams, and the current market price for an ounce of pure gold is $2,000. First, determine the purity fraction: 14 divided by 24 equals approximately 0.5833 (or 58.33% pure gold). Second, calculate the pure gold weight: multiply the 15-gram mass by 0.5833, which gives you 8.75 grams of pure gold. Third, assuming the spot price is expressed in grams or converted appropriately to match your unit of mass, multiply that pure weight by your gram-equivalent price to reveal your total estimated melt value.

Always weigh your items in grams using a calibrated digital scale rather than relying on kitchen scales that might lack precision. Remember that most commercial gold buyers will offer a percentage below the raw spot price to account for refining costs and their operational margins. Verify whether the spot price you are referencing is in troy ounces or grams to avoid massive calculation errors.