Millesimal fineness to karats
Type a value in fineness to get it in kt instantly.
0.432kt
Nothing on our list is smaller: 9 karat gold is 21× purer. A 10 g piece at that purity holds about 0.18 g of pure gold.
Convert the other way: kt to fineness
What it means
How pure is that?
Karat measures purity, not weight. Carat with a c is a gemstone weight of 200 mg, and a different thing entirely.
The math
How to convert fineness to kt
To convert millesimal fineness to karats, multiply by 0.024.
Example: 18 fineness × 0.024 = 0.432 kt.
In the other direction, 1 kt = 41.6667 fineness.
Every unit
Your purity in every unit
Tables
fineness to kt conversion table
| fineness | kt |
|---|---|
| 8 fineness | 0.192 kt |
| 9 fineness | 0.216 kt |
| 10 fineness | 0.24 kt |
| 12 fineness | 0.288 kt |
| 14 fineness | 0.336 kt |
| 15 fineness | 0.36 kt |
| 18 fineness | 0.432 kt |
| 20 fineness | 0.48 kt |
| 21 fineness | 0.504 kt |
| 22 fineness | 0.528 kt |
| 23 fineness | 0.552 kt |
| 24 fineness | 0.576 kt |
kt to fineness conversion table
| kt | fineness |
|---|---|
| 8 kt | 333.333 fineness |
| 9 kt | 375 fineness |
| 10 kt | 416.667 fineness |
| 12 kt | 500 fineness |
| 14 kt | 583.333 fineness |
| 15 kt | 625 fineness |
| 18 kt | 750 fineness |
| 20 kt | 833.333 fineness |
| 21 kt | 875 fineness |
| 22 kt | 916.667 fineness |
| 23 kt | 958.333 fineness |
| 24 kt | 1,000 fineness |
Quick answers
Quick answers
- How many kt is 1 fineness?
- 1 fineness is 0.024 kt.
- How many kt is 10 fineness?
- 10 fineness is 0.24 kt.
- How many kt is 18 fineness?
- 18 fineness is 0.432 kt.
The units
About these units
Millesimal fineness (fineness)
Parts per thousand, the number stamped inside jewellery: 750 is 18 kt.
Karats (kt)
Parts of gold out of 24. Pure gold is 24 kt.
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