A gold weight calculator converts precious metal weights between metric, imperial, and specialized units while accounting for gold purity (karatage). It calculates the pure gold content based on alloy fineness, essential for jewelry appraisals, bullion trading, gemstone valuation, and precious metal investments.

Use this calculator to convert between grams, troy ounces, kilograms, and carats while determining the actual pure gold amount in any alloy karat measurement from 9K to 24K.

Gold purity is measured in karats (K), indicating the fraction of pure gold in an alloy:

• 24K Gold: 100% pure (999.9 fine gold) – Softest, most valuable
• 22K Gold: 91.7% pure – Commonly used in jewelry and coins
• 20K Gold: 83.3% pure – Fine jewelry and decorative items
• 18K Gold: 75% pure – High-quality jewelry, ideal balance of purity and durability
• 14K Gold: 58.3% pure – Most popular for jewelry; durable and practical
• 10K Gold: 41.7% pure – Entry-level, durability for rings
• 9K Gold: 37.5% pure – Legal minimum for "gold" in most countries

1. Enter gold weight: Input the amount in your preferred unit (g, oz, troy oz, etc.).
2. Select input unit: Choose from 8 supported weight measurements.
3. Select gold purity: Pick karat rating from 9K to 24K.
4. Click Calculate: Get instant conversions to all units and pure gold content.
5. Review results: See total weight conversions and pure gold breakdown by unit.

Gold weight calculation is critical in:

• Jewelry Appraisal: Determining value based on purity and weight.
• Precious Metal Trading: Converting market prices across weight units.
• Gemstone Valuation: Assessing weight in carats for diamonds and gems.
• Bullion Investment: Comparing troy ounce spot prices.
• Coin and Medal Manufacturing: Precise alloy composition control.
• Scrap Gold Calculation: Estimating value from total and pure gold weight.

Troy Ounce: Specialized unit for precious metals; 1 troy oz = 31.1035 grams (not the same as regular ounces).

Fineness: Measure of purity as a decimal (e.g., 0.917 for 22K gold, meaning 91.7% pure).

Karatage: Fraction of pure gold per 24 parts (e.g., 18K = 18 parts pure gold out of 24).

Alloy: Mixture of gold with other metals (copper, silver, nickel) to improve durability and reduce cost.

Scenario: You have a 14K gold ring weighing 5 grams.

1. 14K gold contains 58.3% pure gold (14 ÷ 24).
2. Pure gold = 5 g × 0.583 = 2.915 grams.
3. In troy ounces: 5 g ÷ 31.1035 = 0.1607 troy oz total.
4. Pure gold: 2.915 g ÷ 31.1035 = 0.0937 troy oz pure gold.
5. At $2000 per troy oz: Value ≈ 0.0937 × $2000 = $187.40.