How to convert 15K gold to 10K
15K gold is 62.5% pure and 10K gold is 41.7% pure. To find the 10K weight with the same gold content, multiply the 15K weight by 0.625 and divide by 0.417. One gram of 15K equals 1.4988 grams of 10K.
Example
10 g of 15K gold contains 6.25 g of pure gold, the same as 14.988 g of 10K. Today 10 g of 15K is worth $831.99.
When you need this conversion
- Exchanging old jewelry for new pieces in a different karat.
- Comparing prices quoted per gram of 22k with prices quoted for 18k or 24k.
- Planning how much of a karat a jeweler needs to remake an item.
Note that remaking jewelry involves melting losses and labor, so a jeweler's exchange rate is usually below this pure-gold equivalent. See methodology.