Formula
Fineness ÷ 1,000 × 24Purity scale conversion
Fineness to Karat Converter
Convert a gold fineness mark into equivalent karat and percentage. Enter a value such as 750‰ to see the theoretical 18K result without mixing purity conversion with price estimation.
Fixed formula
Conversion tooldeterministic conversionExample
750‰ = 18.00K = 75.00%Needs
No market feed or currency rateToday’s reference
Read a fineness mark as karat
Fineness is expressed in parts per thousand. Dividing by 1,000 and multiplying by 24 produces the equivalent theoretical karat used by this tool; physical hallmarks and assays remain the authority for an item.
Fineness → karat
Convert fineness to karat
Enter a fineness mark from 0‰ to 1,000‰. The result shows the equivalent theoretical karat and percentage.
Equivalent karat
18.00K
Gold percentage75.00%
Formula: fineness ÷ 1,000 × 24. For example, 750‰ equals 18.00K and 75.00%. Hallmarks should still be verified for a physical item.
Helpful answers
Fineness to Karat Converter FAQ
How do I convert fineness to karat?
Divide the fineness mark by 1,000 and multiply by 24. A 750 mark becomes 750/1,000 × 24 = 18K.
What karat is 999 fineness?
999‰ converts to 23.976K on the exact formula, which is commonly described as approximately 24K.
What karat is 585 gold?
585‰ converts to 14.04K on the exact formula, commonly associated with 14K gold.
Can this converter verify a hallmark?
No. It performs the mathematical conversion only. A hallmark can be worn, misread, or inconsistent, so physical verification requires an appropriate test or professional assessment.
Information only, not investment advice. Calculations are theoretical spot / melt value estimates and are not dealer offers, retail prices, jewellery valuations, or scrap buyer quotes.