Gold Purity Calculator

Determine pure gold content, karat rating, hallmark equivalents (999, 916, 750, 585), alloy percentage, and scrap melt value.

Convert between karats and hallmark fineness, and see exact pure gold versus alloy breakdown.

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Input Parameters

For estimating total scrap melt value.

Calculation Result
Calculated Result
91.67% Pure Gold

10 grams of 22K gold contains 9.167 g pure gold and 0.833 g alloy metals.

Summary Breakdown
Purity Percentage
91.67%
Official Hallmark Equivalent
916 (22 Karat Standard)
Pure Gold Content
9.167 grams
Alloy Content (Copper/Silver)
0.833 grams
Estimated Scrap Melt Value

Based on 24K rate of 7,500.00/g

68,750.00
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Calculation Formula & Methodology

Purity % = (Karat / 24) × 100. Pure gold weight = Total weight × (Karat / 24).

All arithmetic is processed locally in your browser session using IEEE 754 precision with boundary checks.

Worked example

Scenario: 10 grams of 22K gold.
Calculated Outcome: 9.167 grams pure gold, 0.833 grams alloy metals (91.67% purity, Hallmark 916).
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Frequently Asked Questions

What does 916 mean on gold jewelry?

916 denotes 22 Karat gold, meaning 916 parts out of 1000 (91.6%) is pure gold, with the remainder composed of strengthening alloys like copper or silver.

What does 750 mean on gold jewelry?

750 denotes 18 Karat gold, meaning 750 parts out of 1000 (75.0%) is pure gold, widely used for diamond rings and gemstone settings.

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