What is Gold Karat Purity Calculator India?
Calculate gold purity percentage from Karat value. 24 Karat = 100% pure gold.
24 Karat gold is 99.9% pure. 22 Karat (used in most Indian jewellery) is 91.7% pure. Enter the Karat value to instantly calculate the gold purity percentage and understand the difference between 14K, 18K, 22K, and 24K gold.
How to use this calculator
Enter any value in the Karat input field above. The result in Purity % appears instantly as you type. The conversion uses the formula:
1 Karat = 4.1667 Purity %
The calculator is bidirectional. Click the swap button to convert from Purity % back to Karat. All calculations run locally in your browser with no data sent to any server.
Conversion formula and reference table
Exact formula: Value in Purity % = Value in Karat × 4.1667. Reverse: Value in Karat = Value in Purity % ÷ 4.1667.
| Karat | Purity % |
|---|---|
| 0.5 Karat | 2.08 Purity % |
| 1 Karat | 4.17 Purity % |
| 2 Karat | 8.33 Purity % |
| 5 Karat | 20.83 Purity % |
| 10 Karat | 41.67 Purity % |
| 25 Karat | 104.17 Purity % |
Conversion accuracy and official sources
The conversion factor used — 1 Karat = 4.1667 Purity % — is sourced from: Bureau of Indian Standards (BIS) hallmarking specifications (IS 1417) and MCX/IBJA official gold weight standards.
Traditional Indian measurement units can vary between districts within the same state, between historical periods, and between formal (government-recorded) and informal (market-practice) usage. The factor used here represents the current officially notified standard.
Step-by-step verification guide
- Obtain official documents first. For land: retrieve Khasra-Khatauni from your state land records portal. For gold: request a BIS hallmark certificate. The area or weight will be stated in the traditional unit alongside the metric equivalent.
- Use calibrated instruments. For land: a licensed surveyor uses a standard Gunter chain (66 feet) or electronic total station. For gold and cooking: use a BIS-certified laboratory balance traceable to the National Physical Laboratory (NPL India).
- Verify boundary markers. Every registered plot has boundary pillars (dhaiya) at corners. Measure each boundary independently and verify against the document dimensions.
- Cross-check with the issuing authority. For any transaction above Rs 10 lakh, an official survey by the revenue department or a BIS-certified assayer is recommended before registration.
- Convert to metric for official submissions. All government filings (RERA, bank valuations, mutation) require metric units. Use the conversion this calculator provides for your official submission documents.
Common errors and how to avoid them
- Assuming a uniform standard across states. The Karat varies significantly by state. Always confirm the state-specific standard before converting.
- Confusing similar-sounding units. Many Indian measurement units share similar names but differ widely in value. For example, Bihar Dhur (68 sq ft) and Tripura Dhur (3.6 sq ft) are entirely different despite the same name.
- Using outdated factors. Some older websites cite historical or regional variants. This calculator uses the current officially notified standard.
- Premature rounding. For property transactions, use full decimal precision. A rounding error of 0.1 Karat on a 10-unit plot can represent a legally significant area.
- Not accounting for deductions. In land measurement, recorded area includes rights-of-way, water channels, and boundary widths. Usable (net) area is typically 95-98% of gross recorded area.
Frequently asked questions
What is the purity of 22 Karat gold?
22 Karat gold is 91.67% pure gold (22/24 × 100).
What is 18 Karat gold purity?
18 Karat gold is 75% pure (18/24 × 100).
Which Karat is used in Indian jewellery?
Most Indian jewellery is 22 Karat (91.67% pure). 24 Karat is used for gold coins and bars.
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Bookmark this page for instant access. Share it with your property broker, jeweller, tailor, or contractor so every party works from the same verified measurement standard.