Standard Gold Bar Weight and Dimensions at Fort Knox
The standard gold bar held at Fort Knox follows the London Good Delivery specification, with a troy ounce weight of 400 oz and a total mass of approximately 27.4 pounds (12.4 kilograms). Each bar carries a fineness of 99.5% gold or higher, and its dimensions are tightly controlled to ensure compatibility with secure storage and handling systems used by the United States Bullion Depository and its partner institutions Forbes.
Under current U.S. Mint and Federal Reserve protocols, the accepted weight tolerance for a single standard bar is very narrow, usually within a few grams of the nominal 400 troy ounce figure, so every bar stored at Fort Knox is treated as a near-identical unit of value for inventory and audit purposes U.S. Mint.
Vault Structure, Security, and Current Holdings
The vault at Fort Knox uses layered physical security, including reinforced concrete, granite, and blast-resistant doors, with access controlled by multiple combinations, biometric checks, and armed military personnel, while the precise gold tonnage is reported by the U.S. Department of the Treasury and periodically confirmed through audits U.S. Department of the Treasury.
Current Gold Inventory and Reporting
As of the latest publicly available Treasury data, the U.S. holds the largest official gold reserve in the world, with the majority stored at Fort Knox and other depositories, and the reported gold weight is expressed in troy ounces and metric tonnes to align with global market reporting standards Federal Reserve.
Comparison With Other Major Reserves
By reported holdings, the United States ranks first among nations with the largest gold reserves, ahead of Germany, Italy, France, and Russia, and the consistent weight of each standard bar helps simplify global comparisons of reserve size and liquidity World Gold Council.
Why Gold Bar Weight Matters for Investors and Institutions
The fixed weight and purity of a standard Fort Knox gold bar make it a reference point for global gold pricing, futures contracts, and central bank reserves, because market participants rely on a consistent unit of mass to calculate value, settle trades, and verify authenticity London Bullion Market Association.
Institutional investors, sovereign wealth funds, and reserve managers use the exact weight and security profile of bars stored at Fort Knox as a benchmark for liquidity and counterparty risk, and any changes in reported holdings or bar specifications can influence market sentiment and allocation decisions across portfolios U.S. Securities and Exchange Commission.