Gold Value Per Gram Calculator
Estimate how much your gold is worth using the current spot price, purity, and weight.
How this value of gold per gram calculator works
Gold is usually quoted in troy ounces, but jewelry and small items are often weighed in grams. This tool bridges that gap by converting spot price into a per-gram number and then adjusting for purity.
The calculator gives you a quick estimate of melt value for rings, chains, coins, and other items where weight and karat matter. It can also simulate dealer payouts by applying an adjustment percentage.
Core formula used
Inputs explained
- Spot Price: Market price for one troy ounce of pure gold (24K).
- Purity: How much of your item is actual precious metal (for example, 18K = 75%).
- Weight: Total item weight in grams.
- Dealer Adjustment: Optional premium or discount used to model real-world buy/sell pricing.
Common gold purity references
- 24K: 99.9% pure gold
- 22K: 91.67% pure gold
- 21K: 87.5% pure gold
- 18K: 75.0% pure gold
- 14K: 58.5% pure gold
- 10K: 41.7% pure gold
Example calculation
Suppose spot gold is $2,950/oz, your ring weighs 10 grams, and the purity is 14K (58.5%). First, convert spot to 24K grams: $2,950 ÷ 31.1034768 ≈ $94.85 per gram. Then adjust for purity: $94.85 × 0.585 ≈ $55.49 per gram of 14K. Multiply by weight: $55.49 × 10 ≈ $554.90.
If a buyer offers 8% below melt value, apply -8% adjustment: $554.90 × 0.92 ≈ $510.51 estimated payout.
Why your real offer can differ
1) Market movement
Gold prices move throughout the day. Even short delays can change your estimate.
2) Testing and verification
Dealers may test items for exact purity and remove stone weight before final pricing.
3) Fees, margins, and liquidity
Retail premiums, refining costs, and dealer margins all affect buyback offers.
Tips for using this tool effectively
- Use a current and reliable spot price source before calculating.
- Weigh items on a digital scale that measures in grams.
- Confirm karat marks and test uncertain pieces.
- Compare multiple dealer offers before selling.
- Use the adjustment field to build best-case and worst-case payout scenarios.
FAQ
Is this exact for what I will be paid?
No. This is an estimate based on your inputs. Final offers depend on testing, fees, and dealer terms.
Can I use this for jewelry and bullion?
Yes. For bullion, use near-100% purity and a premium if applicable. For jewelry, use the karat-based purity.
Why divide by 31.1034768?
Because one troy ounce equals 31.1034768 grams.
Final thoughts
A good value of gold per gram calculator helps you make faster, smarter decisions. Whether you are buying, selling, or simply tracking your collection, understanding spot price, purity, and weight gives you a strong baseline before any transaction.