Convert Gold Purity Instantly
Switch between karat, millesimal fineness, and percentage purity. The essential reference tool for jewelers, gold buyers, and precious metals investors worldwide.
Conversion Result
Visual Purity Comparison
Height proportional to gold purity percentage
Why Use This Karat Converter
Three-Way Conversion
Karat, millesimal, and percentage in any direction.
All Common Purities
Presets for every standard gold purity worldwide.
Custom Values
Enter any karat, millesimal, or percentage value.
Visual Scale
See gold content differences proportionally.
Complete Karat Conversion Table
| Karat | Millesimal (‰) | Percentage (%) | Gold Parts/24 | Common Name |
|---|---|---|---|---|
| 24K | 999 / 999.9 | 99.9% | 24/24 | Fine Gold |
| 22K | 916 | 91.6% | 22/24 | Crown Gold |
| 21K | 875 | 87.5% | 21/24 | — |
| 18K | 750 | 75.0% | 18/24 | Standard Gold |
| 14K | 585 | 58.3% | 14/24 | Jewelry Gold |
| 10K | 417 | 41.7% | 10/24 | Minimum US Gold |
| 9K | 375 | 37.5% | 9/24 | Minimum UK Gold |
| 8K | 333 | 33.3% | 8/24 | Low Gold |
Conversion Formulas
Frequently Asked Questions
585 = 14K gold. 585 parts per thousand pure gold (58.5%). European standard marking. Older pieces may show 583.
Yes. 750 (millesimal) = 18K (karat) = 75% pure gold. Different systems, identical purity.
Divide karat by 24, multiply by 100. 14K = 14÷24×100 = 58.33%. 18K = 75%. 22K = 91.67%.
Ancient Roman system: 24 parts = pure gold. 24 divides evenly by 2,3,4,6,8,12 making alloys easy to express.