Formula
Karat ÷ 24 × 1,000Purity scale conversion
Karat to Fineness Converter
Convert a gold karat value into fineness parts per thousand and a percentage. This is a deterministic purity conversion, separate from gold price and melt-value calculations.
Fixed formula
Conversion tooldeterministic conversionExample
18K = 750‰ = 75.00%Needs
No market feed or currency rateToday’s reference
Karat and fineness use different scales
Karat counts gold parts out of 24, while fineness counts parts out of 1,000. The converter keeps those scales explicit so a hallmark or specification can be compared without inventing a market value.
Karat → fineness
Convert karat to fineness
Enter a karat value from 0K to 24K. The result expresses the same theoretical purity as parts per thousand and percent.
Fineness
750.00‰
Gold percentage75.00%
Formula: karat ÷ 24 × 1,000. For example, 18K is 750‰ and 75.00%. This is a purity conversion, not a price or appraisal.
Helpful answers
Karat to Fineness Converter FAQ
How do I convert karat to fineness?
Divide the karat number by 24 and multiply by 1,000. For example, 18K becomes 18/24 × 1,000 = 750‰.
What fineness is 24K gold?
Using the theoretical 24-part scale, 24K converts to 1,000‰ and 100.00%. Commercial hallmarks may use a nearby fineness convention.
What is 14K gold in fineness?
14K converts to 583.33‰ and 58.33% on the exact 24-part formula used here.
Does fineness tell me the price of gold?
No. Fineness describes purity only. Price also depends on weight, the current market reference, currency, premiums, and buyer terms.
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.