Karats to millesimal fineness
Type a value in kt to get it in fineness instantly.
750fineness
That's about the same as 18 karat gold. A 10 g piece at that purity holds about 7.5 g of pure gold.
Convert the other way: fineness to kt
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 kt to fineness
To convert karats to millesimal fineness, multiply by 41.6667.
Example: 18 kt × 41.6667 = 750 fineness.
In the other direction, 1 fineness = 0.024 kt.
Every unit
Your purity in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many fineness is 1 kt?
- 1 kt is 41.6667 fineness.
- How many fineness is 10 kt?
- 10 kt is 416.667 fineness.
- How many fineness is 18 kt?
- 18 kt is 750 fineness.
The units
About these units
Karats (kt)
Parts of gold out of 24. Pure gold is 24 kt.
Millesimal fineness (fineness)
Parts per thousand, the number stamped inside jewellery: 750 is 18 kt.
Keep going