How It Works
Purity percent equals karat divided by 24, times 100. 24K is 100% pure, 22K is 91.67% pure, 21K is 87.5%, 18K is 75% and 14K is 58.33%.
How to Use
Choose a karat and press Calculate to see its purity percentage and fineness in parts per 1,000.
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Frequently Asked Questions
What does 24K mean?
24K means the gold is 100% pure gold, with no other metals mixed in.
What is 22K gold purity?
22K gold is 91.67% pure gold (22/24), with the rest made up of other metals for strength.
Is 21K gold pure?
21K gold is 87.5% pure. It is common in Gulf countries for jewelry.
What is the purity of 18K gold?
18K gold is 75% pure gold (18/24), or 750 fineness.
How do I convert karat to percentage?
Divide the karat by 24 and multiply by 100. For example, 18 divided by 24 is 0.75, which is 75%.