Why “400-ounce” bars are not identical
A cast gold bar is made by pouring molten metal into a mold, not by cutting every bar to an exact mass. The amount poured and the shape left after cooling can vary, so bars that look alike may weigh somewhat different amounts. In bullion markets, “400 ounces” describes a familiar approximate size, not a promise that every bar contains exactly 400 ounces.
The unit is the troy ounce, used for precious metals; 400 troy ounces is about 12.4 kilograms. A bar’s weight is only part of its specification: its gold purity also matters, because a bar may contain small amounts of other metals.
The recorded weight affects its value
Before a bar changes hands, its recorded weight and purity help establish how much fine gold it contains. A buyer can use those details to calculate its value against the current gold price rather than treating every bar as an identical block. The weight record therefore turns a visible lump of metal into a more precisely accounted-for asset.
That precision matters when bars are traded, stored, or divided among owners. Two bars with the same general size can represent different quantities of gold—and their records make that difference measurable.
