karats to gold hallmarks (kt to hallmark) and hallmark to kt (gold hallmarks to karat) Online Conversion Calculator - Converter / Chart / Table
Convert karats to gold hallmarks
(kt to hallmark)
and gold hallmarks to karats
(hallmark to kt)
Online Conversion Calculator - Converter

This calculator-converter provides conversion of karats to millesimal fineness gold hallmarks (kt to hallmark) and backwards millesimal fineness gold hallmarks to karats (hallmark to kt).


Enter karats or gold hallmarks for conversion:
   

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Rounding options:


Conversion Chart / Table
karat to gold hallmarks Conversion Chart / Table: gold hallmarks to karats Conversion Chart / Table:
kt = hallmark

6 = 250
8 = 333
9 = 375
10 = 417
12 = 500
14 = 583
karat = gold hallmarks
15  = 625
18  = 750
20  = 833
21  = 875
22  = 916
24  = 999 or higher
hallmark = kt

250 = 6
333 = 8
375 = 9
417 = 10
500 = 12
583 = 14
gold hallmarks = karats
625 = 15
750 = 18
833 = 20
875 = 21
916  = 22
999 or higher  = 24

The karat (kt) (outside of US and Canada spelling: carat, abbreviation: ct) is a measure of the purity of gold or platinum alloys. Carat purity is measured as 24 times the purity by mass. Carat rating = 24 * mass of pure gold in the alloy / total mass of the alloy. Therefore, 24 carat rating is a pure pure gold or platinum.
24 karat gold (kt) = 999 gold hallmark (millesimal fineness hallmark) or better, which is close to 100% pure gold. 12-carat gold = 500 millesimal gold fineness hallmark = 50% gold.


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