Metal value
Gold Karat to Purity Converter (K, ‰, %)
Convert gold karat to fineness (parts per thousand) and percent, or back. See the matching hallmark, e.g. 14K = 585. Free, in your browser.
Result
Your result
- Karat
- —
- Fineness
- —
- Gold content
- —
- Nearest common hallmark
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Choose what you have and enter the number.
| Karat | Fineness (‰) | Gold content |
|---|---|---|
| 9K | 375 | 37.5 % |
| 10K | 417 | 41.7 % |
| 14K | 585 | 58.3 % |
| 18K | 750 | 75.0 % |
| 22K | 916 | 91.7 % |
| 24K | 999 | 100.0 % |
How to use it
- Choose karat, fineness or percent.
- Enter the number from the stamp or your paperwork.
- Read the other two values and the nearest common mark.
Pure gold is 24 karat or 1000 parts per thousand. Karat = fineness ÷ 1000 × 24; percent = fineness ÷ 10. Hallmark numbers are rounded down, e.g. 14K = 583.3 ‰ is marked 585.
A stamp is a claim, not a test. Only an assay or a reliable test confirms the real gold content.
Frequently asked questions
Questions about this tool
Is 14K the same as 585?
Yes, as a marking. 14/24 is 58.3%, and the common hallmark for 14K is 585, slightly above the minimum.
How pure is 18K gold?
18K gold is 18/24 gold, which is 75% or 750 parts per thousand.