METAL VALUE, PURITY, CHARGES, AND GOLD LOANS
Gold Karat and Purity Converter
Convert gold karat to theoretical purity percentage and fineness, or compare a purity input with its approximate karat.
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How it works
Theoretical purity percentage = karat ÷ 24 × 100; fineness = purity × 10.
Assumptions and limits
A mathematical karat conversion only. It does not assay an item, verify a hallmark, identify solder or stones, or measure actual composition.
About this calculator
The converter explains the theoretical relationship between a 24-part karat scale, percentage purity, and fineness.
What this tool helps you check
Explain the theoretical relationship among karat, purity percentage, and fineness without claiming to assay an item.
How to use it
- Review the formula and assumptions shown for this gold karat and purity converter.
- Enter the stated karat from 0 to 24.
- Calculate and review theoretical purity and fineness.
- Verify an actual item through its BIS hallmark and appropriate testing.
Source and update
Last reviewed: 2026-08-22
Bureau of Indian Standards — hallmarking overviewFrequently asked questions
What does this gold karat and purity converter calculate?
The converter explains the theoretical relationship between a 24-part karat scale, percentage purity, and fineness.
How should I interpret the result?
Review theoretical purity and fineness. The result changes whenever an input or assumption changes.
Is the result official or guaranteed?
Verify an actual item through its BIS hallmark and appropriate testing.
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