Standard Gold Bar Size and Weight
The gold bars stored at Fort Knox follow the standard Good Delivery bar specification used by major bullion markets. Each bar weighs approximately 400 troy ounces, or about 27.4 pounds, and measures roughly 7 inches long, 3.6 inches wide, and 1.5 inches thick. These bars are produced by accredited refiners and must meet strict purity and marking requirements set by the London Bullion Market Association and the Commodity Exchange Act, as outlined by the U.S. Securities and Exchange Commission.
A single standard gold bar at Fort Knox contains about 99.5 percent fine gold, with a nominal purity of 0.995. The exact dimensions and weight are designed to facilitate secure transport, vault storage, and clearing between central banks and authorized dealers. The bars are stamped with the refiner's mark, weight, purity, and a unique serial number to ensure traceability and authenticity.
Vault Layout and Storage Capacity
The United States Bullion Depository at Fort Knox stores the bulk of the U.S. Treasury's gold reserves in a highly secure vault system. The vault is built with multiple layers of heavy vault doors and is monitored by the United States Mint Police, with access limited to a small number of authorized personnel. The facility is not open to public tours, and the exact inventory details are reported in periodic Treasury and Mint publications.
Gold Inventory and Security Measures
The gold held at Fort Knox represents a significant portion of the U.S. government's official gold reserves, which total around 8,133.5 metric tons as of the latest publicly reported data. The bars are stacked in secure compartments within the vault, and the facility uses layered physical security, electronic surveillance, and strict access controls to protect the holdings. The U.S. Mint, which operates the depository, provides official updates on the gold reserves through its official website.
Historical Context and Current Role
Fort Knox has served as a primary storage site for U.S. gold since the 1930s, when President Franklin D. Roosevelt signed the Gold Reserve Act of 1934, requiring private citizens to surrender most of their gold to the federal government. The depository was constructed to centralize and protect the nation's gold holdings, and it has remained a cornerstone of U.S. monetary policy and reserve management ever since.
Today, Fort Knox functions alongside other U.S. Mint facilities and Federal Reserve vaults as part of the country's broader bullion storage network. The gold bars stored there are considered part of the official reserves of the United States and are accounted for in the Treasury's financial reports. For background on the history of U.S. gold reserves, the Forbes archive provides a detailed timeline of major milestones in American monetary policy.