Scrap Gold Value Calculator

Calculate the melt value of scrap gold by weight, karat purity, and current spot price. Includes dealer discount estimates for real-world payouts.

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Estimated Scrap Gold Value--

Formula & Methodology

How the Scrap Gold Value Calculator Works

The Scrap Gold Value Calculator estimates the melt value of gold items based on weight, purity, and the current market price. Whether selling old jewelry, broken chains, or dental gold, understanding melt value provides a baseline for negotiating with dealers and refiners.

The Scrap Gold Valuation Formula

The calculator applies the following formula:

V = W × (K ÷ 24) × (P_spot ÷ 31.1035)

Where:

V = Melt value of the scrap gold in US dollars
W = Weight of the gold item in grams
K = Karat purity of the gold (e.g., 10K, 14K, 18K, 22K, 24K)
P_spot = Current gold spot price per troy ounce in USD
31.1035 = Number of grams in one troy ounce

Understanding Each Variable

Weight Measurement

Gold weight must be measured accurately using a jeweler's scale calibrated in grams or pennyweights (dwt). One pennyweight equals 1.555 grams. Household kitchen scales often lack the precision needed for small gold items, so a digital scale accurate to 0.01 grams produces the most reliable results.

The Karat Purity System

The karat system expresses gold purity as parts out of 24. Pure gold is 24 karat (24K), meaning 24 out of 24 parts are gold. Common karat values and their gold content include:

24K — 99.9% pure gold (fine gold)
22K — 91.7% gold (common in coins and high-end jewelry)
18K — 75.0% gold (popular in fine jewelry)
14K — 58.3% gold (the most common karat in U.S. jewelry)
10K — 41.7% gold (the minimum karat to be legally sold as gold in the United States)

The formula divides the karat value by 24 to convert purity into a decimal fraction. For example, 14K gold yields 14 ÷ 24 = 0.5833, meaning 58.33% of the item's weight consists of actual gold.

Gold Spot Price and Troy Ounces

Gold trades globally in troy ounces, a unit of measure dating back to the Roman monetary system and still used for precious metals today. One troy ounce equals 31.1035 grams — slightly heavier than a standard (avoirdupois) ounce of 28.3495 grams. The spot price, available in real time from sources like Kitco, reflects the current market price for one troy ounce of pure gold.

Dividing the spot price by 31.1035 converts the per-troy-ounce price into a per-gram price, which the formula then multiplies by the item's weight and purity fraction.

Dealer and Refiner Discounts

Scrap gold buyers rarely pay full melt value. Dealers and refiners typically offer 70–90% of the calculated melt value, keeping 10–30% to cover refining costs, assay fees, overhead, and profit margin. The calculator includes an optional dealer discount field to estimate the actual payout. For example, at a 20% discount, an item with a $500 melt value would yield approximately $400 from a buyer.

Step-by-Step Example Calculation

Consider a 14K gold bracelet weighing 15 grams with gold trading at $2,350 per troy ounce:

Step 1: Convert karat to purity fraction: 14 ÷ 24 = 0.5833
Step 2: Convert spot price to per-gram price: $2,350 ÷ 31.1035 = $75.56 per gram
Step 3: Multiply: 15 × 0.5833 × $75.56 = $661.15 melt value
Step 4: Apply a 20% dealer discount: $661.15 × 0.80 = $528.92 estimated payout

When to Use This Calculator

This scrap gold calculator proves useful in several scenarios:

Comparing offers from multiple gold buyers or pawn shops
Estimating the value of inherited or estate jewelry before appraisal
Determining whether repairing a broken gold item is more cost-effective than selling it for scrap
Verifying dealer quotes against current market prices
Tracking portfolio value of physical gold holdings

Methodology Sources

The melt value formula follows standard precious metals industry practice. The troy ounce conversion factor (31.1035 grams) is documented by Investopedia's Troy Ounce reference. Real-time spot pricing data can be verified through Kitco's live gold price page, one of the most widely cited precious metals data sources. The karat purity system is defined by the gold fineness standards recognized internationally, with the U.S. Mint providing authoritative guidance on precious metal specifications.

Frequently Asked Questions

How do I calculate the value of scrap gold at home?

Weigh the gold item in grams using a jeweler's scale, identify the karat stamp (commonly 10K, 14K, 18K, or 24K), and look up the current gold spot price per troy ounce. Then apply the formula: Value = Weight × (Karat ÷ 24) × (Spot Price ÷ 31.1035). For example, a 10-gram 18K gold ring with gold at $2,350 per troy ounce has a melt value of approximately $566.87.

How much do gold buyers pay for scrap gold compared to melt value?

Most gold buyers, pawn shops, and refiners pay between 70% and 90% of the calculated melt value. The exact percentage depends on the buyer's overhead costs, refining fees, the quantity of gold being sold, and local market competition. Selling directly to a refiner or comparing offers from at least three buyers typically yields the highest payout percentage.

What is the difference between a troy ounce and a regular ounce for gold?

A troy ounce equals 31.1035 grams, while a standard avoirdupois ounce equals 28.3495 grams. The troy ounce is approximately 10% heavier and is the universal unit for trading precious metals including gold, silver, and platinum. Using the wrong ounce type in calculations results in roughly a 10% error in the estimated value, so always confirm the measurement system before calculating scrap gold prices.

How do I find the karat purity of my gold jewelry?

Check the item for a hallmark stamp, typically found on the inside of rings, on clasp tags of necklaces, or on the post of earrings. Common stamps include 10K, 14K, 18K, 22K, or 24K. Some European jewelry uses millesimal fineness markings such as 375 (9K), 585 (14K), or 750 (18K). If no stamp is visible, a professional jeweler can test the gold using acid testing kits, electronic testers, or X-ray fluorescence analyzers to determine exact purity.

Does the gold spot price include the cost of fabrication or craftsmanship?

No. The gold spot price reflects only the raw material value of pure gold on the commodities market. It does not account for craftsmanship, design, gemstones, brand premiums, or historical significance. A scrap gold calculator estimates melt value exclusively — what the gold content alone is worth. Jewelry with artistic, antique, or brand value may sell for significantly more than melt value through specialized dealers or auction houses.

Why does the scrap gold value change every day?

Gold spot prices fluctuate continuously based on global supply and demand, currency exchange rates (particularly the US dollar), central bank policies, geopolitical events, and investor sentiment. The COMEX and London Bullion Market set benchmark prices that update throughout each trading day. Because the scrap gold formula uses the current spot price as a key variable, the calculated melt value changes whenever the spot price moves — sometimes multiple times per hour during active trading sessions.