Karat Calculator
Gold Fineness Calculator
Convert gold karat to fineness and back. 24K = 0.999 fine, 22K = 0.916, 18K = 0.750, 14K = 0.585. Calculate pure gold content.
💎 Gold Fineness Calculator
- Fineness
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- Pure gold (grams)
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- Market value (USD)
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Frequently Asked Questions
What is gold fineness?+
Fineness is a decimal expression of gold purity. 24K = 0.9999 fine, 22K = 0.9167 fine, 18K = 0.7500 fine, 14K = 0.5833 fine. Multiply fineness by weight to get pure gold content.
What is the difference between karat and fineness?+
Karat uses a scale of 24 (24K = pure gold). Fineness uses a scale of 1.000 (0.999 = pure gold). They express the same thing: 18K = 18/24 = 0.750 fineness.
What does "585" stamped on gold mean?+
"585" is the fineness stamp for 14K gold (= 58.5% pure gold). Common on European and US gold jewellery.
What does "750" stamped on gold mean?+
"750" indicates 18K gold (= 75.0% pure gold). You will see this stamp on quality European and US fine jewellery.
What does "999.9" mean on gold bars?+
"999.9" means 99.99% pure gold — the highest commercial purity. Used for investment-grade gold bars and coins. Also called "four nines fine."