Find the current gold price per ounce
Divide the price per ounce by 31.1035 to get the price per gram of pure gold
Check the gold purity or karat of the item
Convert purity to a decimal value
Multiply the pure gold price per gram by the purity decimal
Subtract any dealer fees, making charges, or taxes if needed
Use the formula: Gold price per gram = (Gold price per ounce ÷ 31.1035) × purity
For karats, use purity values such as 24K = 1.000, 22K = 0.9167, 18K = 0.750, 14K = 0.5833
Multiply the final per-gram value by the total weight in grams if calculating total gold value