Gold Purity Calculator
Calculate gold purity. Convert between Karat, millesimal fineness, and percentage. Supports 24K/22K/18K/14K/10K. Essential for jewelry appraisal and trading.
📊 Result Chart
About Gold Purity Calculator
Gold Purity Calculator is a free online tool that converts between karat, millesimal fineness, and percentage. It computes the exact pure gold content from weight and karat, supporting 24K, 22K, 18K, 14K and 10K — the most common standards in jewelry and trading.
Gold Purity Calculator in 3 steps
- Enter the gold weight in grams
- Select the karat purity (24K to 10K)
- Click "Calculate" to see pure gold content, percentage and per mille
What is gold karat purity?
Karat (K) measures the proportion of pure gold in an alloy. 24K is 99.9% pure gold, 18K is 75% pure, and 14K is 58.3% pure. The rest is alloyed with other metals for strength.
Is this tool free to use?
Yes, it is completely free with no signup required. All calculations run locally in your browser and your data never leaves your device.
How do I calculate pure gold content?
Enter the gold weight in grams and select the karat purity, then click Calculate. The pure gold content is weight multiplied by the purity fraction, e.g. 50g of 18K gold contains 37.5g of pure gold.
What is Gold Purity Calculator?
Gold Purity Calculator is a free online tool that runs entirely in your browser. No download or signup needed — enter Gold Weight and Karat Purity to get results instantly. All data is processed locally.
Use Cases
- Verify the pure gold content of jewelry before buying or selling
- Convert between karat, fineness and percentage for international trading
- Estimate material value when assessing gold items for scrap
- Check gold purity quickly on mobile without installing an app
Key Features
- Completely Free: No registration, no limits
- Privacy Safe: Data never leaves your browser
- Cross-Platform: Any modern browser
- Zero Dependencies: Open and use