Gold Price Per Gram Calculator
Estimate melt value and adjusted market value for your gold jewelry, coins, or scrap based on spot price, purity, and weight.
This is an educational estimate. Dealer buyback rates and taxes may differ.
How this gold price per gram calculator works
Gold is usually quoted globally in price per troy ounce, but most people buy and sell gold by the gram. This calculator converts the ounce-based spot price into grams, then adjusts for purity and optional premiums or discounts.
melt value per gram = pure gold per gram × (purity % ÷ 100)
adjusted value per gram = melt value per gram × (1 + premium% / 100) + making charge
Why purity matters so much
Not all gold items are pure 24K. A 24K bar and a 14K ring can have the same weight, but very different gold content. That is why using karat (or purity percentage) is essential for fair valuation.
- 24K is close to pure gold (about 99.9%).
- 22K is commonly used in jewelry and investment jewelry.
- 18K balances durability and high gold content.
- 14K/10K are more durable but contain much less pure gold.
Step-by-step usage
1) Enter spot price
Use the current market quote from a trusted source. If your quote is already in your local currency, keep your currency symbol consistent so the result reads naturally.
2) Select karat or custom purity
Choosing a karat auto-fills the purity field. If your item has assay data, switch to custom purity and type the exact percent.
3) Enter total weight in grams
Use a precise scale whenever possible. For jewelry, very small differences in weight can noticeably change estimated value.
4) Add premium, discount, or making charges
Coins and branded bars often trade above melt value (premium). Scrap sales often happen below melt value (discount). You can enter negative values for discount.
Example calculation
Suppose spot gold is $2,300/oz, your item is 18K (75%), and weight is 12g:
- 24K price per gram ≈ 2,300 ÷ 31.1034768 = $73.95
- 18K melt value per gram ≈ 73.95 × 0.75 = $55.46
- Total melt value ≈ 55.46 × 12 = $665.52
If you add a 5% premium, the adjusted total increases accordingly. The calculator handles this instantly.
When to use this calculator
- Checking if a jewelry store quote is reasonable
- Comparing buyback offers from multiple gold buyers
- Estimating value of inherited gold items
- Tracking portfolio value for physical gold holdings
- Planning purchases of coins, bars, or jewelry
Important limits to know
A calculator gives a strong estimate, but final transaction prices can vary due to:
- Dealer margins and testing fees
- Local taxes, duties, and VAT
- Brand premiums (minted coins, designer jewelry)
- Condition, collectibility, and resale demand
- Real-time spot price movement during negotiation
Bottom line
A reliable gold price per gram calculator helps you make smarter buying and selling decisions. Use it as your baseline: start with spot, convert properly, apply purity, then adjust for real-world pricing. That one habit can save money, avoid underpriced sales, and improve confidence in every gold transaction.