How Does a Gold Karat Calculator Work?
The Mid-States Karat Kalculator estimates the refining payout for karat gold scrap submitted by jewelers, pawnbrokers, and precious metal dealers. It applies the current New York gold spot price to your entered karat purity percentages, then deducts Mid-States' refining rate and treatment fee to produce your estimated net payout.
Select the weight unit
Choose DWT (pennyweight), grams, or troy ounces. DWT is the U.S. jewelry trade standard (20 DWT = 1 troy ounce); grams are the metric equivalent (31.1035g = 1 troy ounce).
Enter weight by karat category
The calculator accepts 8K, 10K, 12K, 14K, 16K, 18K, 21.6K, 22K, 23K, 24K, and Bench Filings. Karat indicates pure gold proportion — 14K = 58.3%, 24K = 99.9%. Each row calculates independently, so mixed karat lots are fully supported.
Review your results
Click Calculate to display:
- Final estimated value after refining charges (net payout)
- Total weight in troy ounces
- Estimated pure gold content in troy ounces
- Estimated payable silver content, included in your Mid-States settlement
Karat Gold Purity Chart: Gold Content, Fineness, & Refining Value by Karat
Karat measures the proportion of pure gold in an alloy on a 24-part scale — 1 karat = 1/24th pure gold. 14K contains 14 parts gold and 10 parts alloying metals (58.3% pure); 24K is 99.9% pure. Refining payout is directly proportional to karat: higher karat = higher gold content per
ounce = higher gross value before refining charges.
The table below maps each karat grade accepted by Mid-States to its purity percentage, millesimal fineness stamp (the three-digit hallmark on European and international jewelry), primary alloying metals, and typical commercial source. Use it to identify and sort your lots before entering weights.
| Karat | Gold Purity (%) | Millesimal Fineness | Primary Alloying Metals | Typical Commercial Source |
|---|---|---|---|---|
| 8K | 33.3% | 333 | Silver, copper, zinc | European fashion jewelry; vintage German pieces |
| 10K | 41.7% | 417 | Silver, copper | U.S. mass-market jewelry (minimum legal gold designation in the U.S.) |
| 12K | 50.0% | 500 | Silver, copper | Vintage U.S. jewelry, antique watch cases |
| 14K | 58.3% | 585 | Silver, copper | Most common U.S. jewelry karat; rings, chains, settings |
| 16K | 66.7% | 667 | Silver, copper | Less common; some Southeast Asian and vintage European pieces |
| 18K | 75.0% | 750 | Silver, copper, palladium (white gold) | Fine jewelry, luxury watches, European standard |
| 21.6K | 90.0% | 900 | Silver, copper | Middle Eastern and Islamic jewelry tradition; Gulf region bridal gold |
| 22K | 91.7% | 916 | Silver, copper | British hallmark standard; Indian bridal and temple jewelry |
| 23K | 95.8% | 958 | Silver, copper | High-purity decorative pieces; some Asian markets |
| 24K | 99.9% | 999 | None (pure gold) | Bullion bars, investment coins, industrial-use gold |
| Bench Fillings | Variable | Variable | Variable | Scrap from jewelry fabrication benches; mixed karat dust and filings |
Gold Weight Units Explained: Pennyweight (DWT), Grams, and Troy Ounces
The Karat Kalculator accepts three weight units — pennyweight (DWT), gram (g), and troy ounce (t/oz) — each standard in a different sector of the precious metals trade.
Select the unit your scale or records already use; no conversion is needed before entering weights.
Pennyweight (DWT)
U.S. Jewelry Trade Standard
The pennyweight is the primary weighing unit for jewelers, pawnbrokers, and precious metal dealers in the United States, derived from the medieval English troy weight system (1 troy ounce = 20 pennyweights). The 20:1 ratio makes DWT practical for sub-ounce jewelry quantities. Select DWT if your scale or inventory records use pennyweights.
Gram (g)
Universal Metric Standard
The gram is the SI base unit of mass and the default on most digital scales outside the United States. Its fixed relationship to precious metals pricing: 1 troy ounce = 31.1035 grams. Select Grams if your scale is metric.
Troy Ounce (t/oz)
Global Commodity Standard
The troy ounce is the international benchmark for pricing gold, silver, platinum, and palladium. It is heavier than the avoirdupois ounce used for everyday goods — 31.1035g vs. 28.3495g, approximately 9.7% difference. Always confirm your scale is calibrated to troy ounces, not standard ounces, before weighing. Select Troy Ounces if weighing larger lots or working from refinery settlement statements.
Quick Weight Conversion Table
Use these precise multiplier constants to convert raw scrap gold measurements to your target reporting system.
| Starting Unit | Convert to DWT | Convert to Grams | Convert to Troy Ounces |
|---|---|---|---|
| 1 DWT (Pennyweight) | — | × 1.55517 = 1.555 g | × 0.05 = 0.05 t/oz |
| 1 Gram (g) | × 0.64301 = 0.643 DWT | — | × 0.032151 = 0.03215 t/oz |
| 1 Troy Ounce (t/oz) | × 20 = 20 DWT | × 31.1035 = 31.1035 g | — |
Example: 35 grams of 14K gold → 35 × 0.64301 = 22.5 DWT. Enter 22.5 in the 14K row with DWT selected.
How to Maximize Your Gold Refining Payout: Professional Refining Tips
Gold refining payout depends on two factors: lot preparation before shipping and accurate karat identification.
These tips reflect Mid-States' 40+ years serving jewelers, pawnbrokers, and estate buyers.
Tip 1: Separate Your Gold by Karat Before Submission 
Mixed karat lots are melted into one bar and assayed as a single blended result, which undervalues higher-karat material. Submit 10K, 14K, and 18K pieces as separate lots or labeled bags within one shipment so each settles at its verified purity.
Example: A 100-DWT lot containing equal weights of 10K and 18K gold would assay at approximately 14K (58.3% purity) if blended. When settled separately, the 18K portion earns a 75% purity payout and the 10K portion earns 41.7%, producing a higher combined return. Separating lots is the highest-value preparation step available at no cost.
Tip 2: Weigh Your Gold Before Shipping and Record the Weight
Every refining settlement uses the refiner's incoming weight, recorded when your shipment is received and logged. This weight forms the basis of your settlement statement. If a discrepancy occurs, your pre-shipment weight provides a documented baseline for clarification.
Use a calibrated jewelry scale set to troy ounces or pennyweights, not avoirdupois ounces. Record the weight by karat category in the format used in the Karat Kalculator. Keep the record with your shipping tracking number until you verify your settlement statement.
Record the date, scale unit, weight for each karat lot, total weight, and identifying notes such as "35 DWT – 14K yellow gold chains, no stones." This documentation supports inventory records.
Tip 3: Remove Gemstones, Findings, and Non-Gold Components
Fire assay measures precious metal content as a percentage of total melt weight. Non-gold material adds weight without adding gold, lowering calculated purity and reducing payout. This includes gemstones, diamonds, steel springs, base metal findings, ceramic watch parts, and solder-heavy components. Remove all before shipping. Mid-States provides gemstone and diamond removal; recovered stones are returned with your settlement.
Tip 4: Identify and Test Unknown Karats
The karat assigned in the Karat Kalculator determines both your estimate and your lot grouping — though the final fire assay determines actual purity regardless. For pieces without readable hallmarks, test using an acid kit, electronic gold tester, or XRF (X-ray fluorescence) analyzer before submitting. If testing is unavailable, submit unknown material as a separate lot identified on your packing list — Mid-States will assay and settle it on verified content.
Tip 5: Keep Bench Filings Separate
Bench filings contain mixed karat fragments, solder, polishing compounds, base metal residue, and, in some cases, platinum or palladium. Their composition varies significantly.
The Karat Kalculator applies a conservative estimate for bench filings.
Submit bench filings as a standalone lot. Do not combine them with solid karat jewelry. Separate processing protects the value of your jewelry and allows filings to be settled according to recovered precious metal content.
Today's Gold Prices
| Per D.W.T. | |
|---|---|
| 10K | $87.38 |
| 14K | $121.02 |
| 18K | $156.85 |
| Per Gram | |
|---|---|
| 10K | $56.20 |
| 14K | $77.89 |
| 18K | $101.09 |
Ready to turn your estimate into a real payout?
The Karat Kalculator gives you a strong estimate, but your actual return is determined through our melt and fire assay process, which is the most accurate method in the industry. At Mid-States, we offer same-day settlements on smaller lots, full transparency from receipt to payment, and over 40 years of experience serving jewelers and pawnbrokers nationwide.
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.Frequently asked questions
- How do I calculate how much my gold is worth?
Calculate your gold's intrinsic value by multiplying the item's weight by its gold purity and the current gold price per gram.
Gold Value = Weight × Purity × Current Gold Price per Gram
Gold purity is determined by the item's karat.
For example, 14K gold is 58.3% pure and 18K gold is 75% pure. The Karat Kalculator applies this formula using the current market price of gold to estimate the gold value.
- How do you calculate the karat of gold?
Gold karat measures purity on a 24-part scale, where 24K represents nearly pure gold. Divide the karat number by 24 and multiply by 100 to calculate the percentage of pure gold in the item.
Common conversions include:
- 10K = 41.7% pure gold
- 14K = 58.3% pure gold
- 18K = 75% pure gold
- 22K = 91.6% pure gold
- 24K = 99.9% pure gold
The purity percentage is used to calculate the gold content and estimate the item's value.
- Does the Karat Kalculator fetch live prices?
Yes. The Karat Kalculator uses the current market price of gold to estimate the value of your gold based on its weight and purity. Because gold prices change throughout the trading day, calculated values may change as market prices are updated.
- What is the difference between gold purity and gold karat?
Gold purity is the percentage of pure gold in an item. Gold karat (K) is the measurement used to express that purity on a 24-part scale. For example, 24K is approximately 99.9% pure gold, 18K is 75% pure, and 14K is 58.3% pure. The purity percentage determines the amount of pure gold in an item and is used to calculate its intrinsic gold value.
- What is the difference between spot price and gold resale value?
The spot price is the current market price of pure gold used as the benchmark for gold valuation. Gold resale value is the amount a buyer may pay for a gold item after considering its weight, purity, refining costs, and dealer margins. Because most gold items are not pure gold and resale transactions include processing costs, the resale value is typically lower than the equivalent spot price.
- What does the gold hallmark on my jewelry mean?
A gold hallmark is a stamp that identifies the purity of a gold item. Hallmark numbers correspond to the amount of pure gold in the alloy and can be used to determine its karat. Common hallmarks include:
- 417 = 10K (41.7% pure gold)
- 585 = 14K (58.3% pure gold)
- 750 = 18K (75% pure gold)
- 916 = 22K (91.6% pure gold)
- 999 = 24K (99.9% pure gold)
Knowing the hallmark helps determine the item's gold content and estimate its value.
- How is scrap gold value calculated?
Scrap gold value estimates the value of the gold content in an item before refining costs or dealer deductions. It is calculated using the item's weight, gold purity, and the current gold price per gram.
Scrap Gold Value = Weight × Gold Purity × Current Gold Price per Gram
The Karat Kalculator uses this formula to estimate the intrinsic value of the gold contained in the item.
- What is the difference between 22K and 24K gold?
The main difference between 22K and 24K gold is purity. 22K gold contains 91.6% pure gold, with the remaining percentage made up of alloy metals that improve strength and durability. 24K gold contains approximately 99.9% pure gold, making it softer but giving it a higher intrinsic gold value per gram. Because of these properties, 22K gold is commonly used for jewelry, while 24K gold is often used for bullion and investment products.
- Why does 14K gold cost less than 18K gold?
14K gold costs less than 18K gold because it contains a lower percentage of pure gold. 14K gold is 58.3% pure, while 18K gold is 75% pure. For two items of the same weight, 18K contains more pure gold, giving it a higher intrinsic value when calculated using the current market price of gold.
- How accurate is the Karat Kalculator estimate?
The Karat Kalculator provides a strong approximation based on today's live gold spot price and Mid-States' standard refining schedule. Your actual settlement is determined by melt and fire assay results, which yield the most precise measurement of your gold's true content. In most cases, your final payment may be higher than the calculator estimate, because the assay often reveals slightly higher purity than nominal karat ratings.
- What does "1/2 karat under plumb" mean?
This is a standard industry convention applied to all karat gold calculations. A piece stamped 14K is calculated as 13.5K for settlement purposes, because the stamp indicates a minimum purity floor, not an exact measurement. This protects both the refiner and the customer from inflated estimates on borderline pieces.
- Can I use the Karat Kalculator to estimate the value of gold coins or bullion bars?
The Karat Kalculator is optimized for karat jewelry and scrap gold. For gold bullion (24K bars and coins), the spot price and a simple weight conversion are sufficient for a direct estimate. For mixed lots containing both jewelry and bullion, separate them and calculate each category independently.
- Why does the calculator show an "Estimated Payable Silver Value"?
Karat gold alloys contain silver as the primary alloying metal alongside gold. For example, 14K gold is 58.3% gold, with the remaining 41.7% made up of silver, copper, and other base metals. Mid-States recovers and pays for the silver content of your gold lot as part of your complete settlement.
- What is the difference between accountability and treatment charge?
Accountability is the percentage of your recovered precious metal content that Mid-States pays you for (e.g., 98% accountability means you receive value for 98% of the gold recovered, with 2% retained to cover inherent process losses). Treatment charge is a processing fee that covers melting, sampling, and laboratory assay costs.
- How do I convert my gold weight from grams to pennyweights (DWT)?
Multiply grams by 0.6430 to convert to DWT, or divide DWT by 0.6430 to get grams. For troy ounces, divide grams by 31.1035. The Karat Kalculator accepts all three units — simply select your measurement from the dropdown before entering weights.
- Does the Karat Kalculator work for platinum and silver?
This calculator is specific to karat gold. Mid-States also offers a  Platinum Calculator for estimating platinum jewelry value and a  Sterling Silver Calculator for sterling silver. Both are accessible from the links below the calculator.