Millesimal fineness to percent gold
Type a value in fineness to get it in % instantly.
1.8%
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: % 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 %
To convert millesimal fineness to percent gold, multiply by 0.1.
Example: 18 fineness × 0.1 = 1.8 %.
In the other direction, 1 % = 10 fineness.
Every unit
Your purity in every unit
Tables
fineness to % conversion table
| fineness | % |
|---|---|
| 8 fineness | 0.8 % |
| 9 fineness | 0.9 % |
| 10 fineness | 1 % |
| 12 fineness | 1.2 % |
| 14 fineness | 1.4 % |
| 15 fineness | 1.5 % |
| 18 fineness | 1.8 % |
| 20 fineness | 2 % |
| 21 fineness | 2.1 % |
| 22 fineness | 2.2 % |
| 23 fineness | 2.3 % |
| 24 fineness | 2.4 % |
% to fineness conversion table
| % | fineness |
|---|---|
| 8 % | 80 fineness |
| 9 % | 90 fineness |
| 10 % | 100 fineness |
| 12 % | 120 fineness |
| 14 % | 140 fineness |
| 15 % | 150 fineness |
| 18 % | 180 fineness |
| 20 % | 200 fineness |
| 21 % | 210 fineness |
| 22 % | 220 fineness |
| 23 % | 230 fineness |
| 24 % | 240 fineness |
Quick answers
Quick answers
- How many % is 1 fineness?
- 1 fineness is 0.1 %.
- How many % is 10 fineness?
- 10 fineness is 1 %.
- How many % is 18 fineness?
- 18 fineness is 1.8 %.
The units
About these units
Millesimal fineness (fineness)
Parts per thousand, the number stamped inside jewellery: 750 is 18 kt.
Percent gold (%)
The share of gold by weight: 18 kt is 75%.
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