Metal Purity Converter
Enter one positive purity value and convert it locally between K, thousandths, and percent.
A QUICK WALKTHROUGH
How to use this tool
- Enter a value from the selected purity unit.
- Choose karat, thousandths, or percentage.
- Review the equivalent purity values.
Documented linear relationship
The converter uses K ÷ 24 = percentage ÷ 100 = thousandths ÷ 1000. It describes fineness mathematically and does not identify alloys, assay results, or legal marks.
Defined bounds
Karat accepts 0–24 K, thousandths accepts 0–1000, and percentage accepts 0–100. Results are rounded for display.
GOOD TO KNOW
Common questions
Is 24K always pure metal?
No. This calculator only applies the stated linear relationship and does not certify material purity.
What does 750 mean?
750 thousandths equals 75%, which equals 18K under this relationship.
Is my value uploaded?
No. Conversion happens locally in your browser.