How to convert 10K gold to 15K
10K gold is 41.7% pure and 15K gold is 62.5% pure. To find the 15K weight with the same gold content, multiply the 10K weight by 0.417 and divide by 0.625. One gram of 10K equals 0.6672 grams of 15K.
Example
10 g of 10K gold contains 4.17 g of pure gold, the same as 6.672 g of 15K. Today 10 g of 10K is worth $555.10.
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.