Start with the terms that make gold prices easier to interpret and bullion quotes easier to compare.
Gold is commonly quoted per troy ounce. One troy ounce equals 31.1034768 grams. An ordinary household ounce is different. When reading a product description, check whether its stated weight is total mass or fine gold content.
Fineness is the proportion of gold in the material. A fineness of 999.9 corresponds to 99.99% gold by mass. A 100 gram bar at that fineness contains 99.99 grams of gold. For coins described by their fine gold weight, do not apply purity a second time.
A physical product can include a premium over metal value. Compare like-for-like weights, fineness, payment methods and delivery arrangements. A purchase premium is different from a dealer’s buyback spread.
Ask who legally owns the metal, whether specific holdings are identified, whether they are segregated, what the audit and insurance cover, and how withdrawal or resale works. Definitions and contractual rights must be checked with the provider.
A gold price expressed in another currency also depends on the exchange rate. A change in your local currency price may reflect gold, the exchange rate, or both. This platform’s calculator works entirely in US dollars and does not fetch exchange rates.