Gold Conversion Rate & Purity Calculator
Grams (g)
Troy Ounces (oz t)
Kilograms (kg)
Pennyweight (dwt)
24K (99.9% Pure)
22K (91.6% Pure)
20K (83.3% Pure)
18K (75.0% Pure)
14K (58.3% Pure)
10K (41.7% Pure)
9K (37.5% Pure)
Purity Percentage:
Fine Gold Content (Grams):
Fine Gold Content (Troy Oz):
Estimated Pure Gold Value:
Understanding Gold Conversion Rates
Gold is rarely used in its 100% pure form for jewelry because it is too soft. To make it durable, it is alloyed with other metals like copper, silver, or zinc. The Gold Conversion Rate Calculator helps you determine exactly how much "Fine Gold" (pure gold) is contained within a specific piece based on its weight and karat rating.
Karat to Percentage Conversion Table
The "Karat" system measures the purity of gold in 24 parts. To find the decimal conversion rate, you divide the Karat by 24:
- 24 Karat: 24/24 = 99.9% Pure
- 22 Karat: 22/24 = 91.6% Pure
- 18 Karat: 18/24 = 75.0% Pure
- 14 Karat: 14/24 = 58.3% Pure
- 10 Karat: 10/24 = 41.7% Pure
Common Gold Weight Units
The precious metals market primarily uses Troy Ounces, which are different from standard US ounces. One Troy Ounce is approximately 31.1035 grams, whereas a standard ounce is roughly 28.35 grams. Jewelers also frequently use Pennyweight (dwt), where 1 pennyweight equals 1.555 grams.
Calculation Example
If you have an 18K gold ring weighing 10 grams:
- Determine purity: 18 / 24 = 0.75 (75%).
- Multiply total weight by purity: 10g x 0.75 = 7.5g.
- Result: Your ring contains 7.5 grams of pure gold and 2.5 grams of alloy metals.