How It Works
Purity percent equals karat divided by 24, times 100. Fineness is the same fraction times 1,000, so 18K is 750 fineness.
How to Use
Choose a karat and press Convert to see its purity percent and fineness.
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Frequently Asked Questions
What is gold purity percentage?
It is the share of pure gold in an item. 24K is 100%, 22K is 91.67%, 21K is 87.5%, 18K is 75% and 14K is 58.33%.
What is fineness?
Fineness is purity in parts per 1,000. 18K gold is 750 fine, and 22K gold is 916 fine.
Is 24K gold always 100% pure?
24K means 99.9% or higher purity in practice. Small traces of other metals can remain from refining.
How do I convert 22K to a percentage?
Divide 22 by 24 and multiply by 100, which gives 91.67%.
Does purity affect price?
Yes. At the same weight, higher purity gold has a higher metal value because it contains more pure gold.