Calculate the purity percentage and pure gold weight of any jewellery using its karat rating — free and instant.
The Gold Purity Calculator converts the karat rating of any gold item into a purity percentage and the actual pure-gold weight in grams, ounces, and troy ounces. Useful for buyers, sellers, jewellers, and anyone evaluating gold investments or heirlooms.
Gold is alloyed with other metals for hardness; pure gold is too soft for everyday jewellery. Karat (K) measures how many parts out of 24 are gold:
24K = 99.9% pure gold (investment bullion)
22K = 91.6% gold (traditional Indian jewellery)
18K = 75% gold (premium jewellery worldwide)
14K = 58.3% gold (durable everyday jewellery, common in the US)
10K = 41.7% gold (entry-level jewellery)
Enter the total weight of the item in grams.
Select or enter the karat rating (10K, 14K, 18K, 22K, 24K, or custom).
Get the pure-gold weight in grams, ounces, and troy ounces, plus the purity percentage.
1 troy ounce = 31.1035 grams (used for precious metals)
1 standard ounce = 28.3495 grams
An 18K ring weighing 10g contains 75% × 10 = 7.5g of pure gold (≈0.241 troy oz).
Buyers verifying jewellery value before purchase. Sellers calculating melt value. Jewellers pricing custom pieces. Investors comparing bullion versus jewellery purity. Insurance valuers documenting collections.
Always confirm karat rating from the official hallmark stamp on the jewellery. Live gold prices fluctuate — pair this calculator with a current gold spot price for melt-value estimates. Resale value is often below melt value due to crafting costs.
How to Use Gold Purity Calculator
Enter or paste the content you want to process using the gold purity calculator.
Adjust any available settings or options to customize the output.
View, copy, or download your processed results instantly.
Calculate the purity percentage and pure gold weight of any jewellery using its karat rating — free and instant.
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