How to convert 8K gold to 9K
8K gold is 33.3% pure and 9K gold is 37.5% pure. To find the 9K weight with the same gold content, multiply the 8K weight by 0.333 and divide by 0.375. One gram of 8K equals 0.888 grams of 9K.
Example
10 g of 8K gold contains 3.33 g of pure gold, the same as 8.88 g of 9K. Today 10 g of 8K is worth $443.28.
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.