# Gold Hallmarks to Karats

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

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## Conversion Table

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

The millesimal fineness gold hallmark system is used to denote the purity of gold, platinum or silver alloys by parts per thousand of pure metal by mass in the alloy. Therefore, an alloy containing 50% gold is denoted as "500", 75% gold = "750" etc. Many European countries use millesimal hallmark stamps rather than karat rating stamps.
999 gold hallmark (millesimal) or better, which is close to 100% pure gold = 24 karat gold (kt). 500 millesimal fineness gold hallmark = 12-karat gold = 50% gold alloy.

## Weight Conversion

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