To use a Gold Calculator correctly, it is important to understand gold purity and weight. Gold purity is measured in karats (K). Pure gold is 24K, which means it contains almost 100% gold. However, pure gold is very soft, so jewelry is usually made with 22K, 18K, or 14K gold. 22K gold contains about 91.6% pure gold and is commonly used in jewelry. 18K gold has 75% gold mixed with other metals. The lower the karat, the less pure the gold, and the lower its value. A Gold Calculator uses these purity levels to calculate the correct price. A Gold Calculator is extremely useful when buying gold. Before purchasing gold jewelry, coins, or bars, you can calculate the expected price using the calculator. This helps you avoid overpaying and ensures you get value for your money.