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.

Enter your details

Use your own rate, period, and account details for a clear scenario.

India · ₹

You can enter Latin or Devanagari digits. Amounts may include commas or ₹.

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Your result

Ready when you are.

Enter your values and choose Calculate. Your inputs stay on this device.

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

  1. Review the formula and assumptions shown for this gold karat and purity converter.
  2. Enter the stated karat from 0 to 24.
  3. Calculate and review theoretical purity and fineness.
  4. Verify an actual item through its BIS hallmark and appropriate testing.

Build a reliable scenario

How to use and verify your Gold Karat and Purity Converter result

Gold Karat and Purity Converter helps you check a specific gold & jewellery question with figures that apply to you. Convert gold karat to theoretical purity percentage and fineness, or compare a purity input with its approximate karat. Explain the theoretical relationship among karat, purity percentage, and fineness without claiming to assay an item. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.

Before calculating

Prepare Gold karat. 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. Keep units, dates, currency, and time periods consistent.

What changes the result?

The stated method is: Theoretical purity percentage = karat ÷ 24 × 100; fineness = purity × 10. Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.

When checking the answer

A mathematical karat conversion only. It does not assay an item, verify a hallmark, identify solder or stones, or measure actual composition. Use BIS hallmark details and a qualified assay for actual purity; this conversion is not proof of metal content.

Quick verification checklist

  • • Confirm the date and unit of every input.
  • • Replace defaults with values that match your case.
  • • Compare the answer with a second scenario.
  • • Use the official source for regulated or high-impact decisions.

Source and update

Last reviewed: 2026-08-22

Bureau of Indian Standards — hallmarking overview

Frequently 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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