Gold Gram Calculator
Estimate the melt value of your gold based on weight, purity, and current spot price.
How this gram calculator gold tool works
A gram calculator for gold helps you estimate the value of jewelry, coins, or scrap gold quickly. The calculator converts your gold weight from grams into troy ounces (the unit used in precious metals markets), applies purity, and then multiplies by the current spot price.
This is useful when you want a fast estimate before visiting a jeweler, pawnbroker, or bullion dealer. It is not a final offer, but it gives you a strong baseline for negotiation.
Core formula used in the calculator
Step 1: Find pure gold grams
Pure Gold (g) = Total Weight (g) × Purity (%)
Example: 20g of 18K gold (75%) contains 15g of pure gold.
Step 2: Convert grams to troy ounces
Troy Ounces = Grams ÷ 31.1034768
Since gold is priced in troy ounces, this conversion is essential.
Step 3: Apply spot price and adjustment
Estimated Melt Value = Pure Troy Ounces × Spot Price
Then premium/discount is applied:
Adjusted Value = Melt Value × (1 + Premium%/100)
Gold purity quick reference
- 24K = 99.9% pure
- 22K = 91.6% pure
- 18K = 75.0% pure
- 14K = 58.5% pure
- 10K = 41.7% pure
When this estimate may differ from real offers
Actual buy offers can vary due to:
- Dealer margins and refining fees
- Testing uncertainty (especially mixed alloys)
- Condition and resale demand of the item
- Brand premiums for specific jewelry or coins
- Market volatility between quote time and sale time
Tips for buyers and sellers
If you are selling gold
- Get at least 2–3 quotes from different buyers.
- Ask whether the quote is based on gross or pure weight.
- Check live spot prices before accepting an offer.
If you are buying gold
- Know the karat and total weight.
- Compare premium over melt value, not just sticker price.
- Request documentation for coins, bars, and high-value pieces.
Final note
This gram calculator gold page is designed for quick, practical estimates. Use it to understand the numbers, improve your confidence, and make better decisions when buying or selling precious metals.