A standard gold bar weighs around 400 troy ounces, or 27.4 pounds (12.4 kilograms). Banks around the world use this weight. To have a better understanding, it is about the size of a regular brick. However, the kind of gold bar investors would buy for their portfolios doesn’t weigh that much. The most common size traded around the world is one troy ounce or 1.097 ounces.