Standard Gold Bar Size and Weight at Fort Knox
Fort Knox stores gold bars that follow the standard Good Delivery specification used by major gold markets. These bars typically weigh 400 troy ounces, which is about 27.4 pounds or 12.4 kilograms, and measure roughly 7 inches long, 3.6 inches wide, and 1.7 inches tall. The bars are cast from refined gold with a purity of at least 99.5 percent, and they are stored in secure vaults managed by the United States Bullion Depository. This standard size is also used by institutions and central banks worldwide, and it is the same format referenced by the London Bullion Market Association in its official guidelines London Bullion Market Association.
The weight and dimensions are tightly controlled so that each bar can be easily verified, traded, and stored in large stacks. A single 400-ounce bar contains about 27.4 pounds of pure gold, and its value fluctuates with the spot price of gold. Because of the uniform size, vaults at Fort Knox can use standardized pallets and racks to organize the bars efficiently. The U.S. Department of the Treasury oversees the depository and publishes periodic reports on the gold holdings U.S. Department of the Treasury.
Vault Layout and Storage Capacity at Fort Knox
The vault at Fort Knox is designed to hold a massive amount of gold in a compact, highly secure space. The gold bars are stacked in reinforced compartments, and the total gold inventory has historically included hundreds of tons of metal. The depository is located within the Fort Knox military installation in Kentucky, and access is restricted to authorized personnel with multiple layers of physical and electronic security. The exact current tonnage is reported in official Treasury disclosures, and the facility is known for its strict protocols around movement and auditing of the bars United States Mint.
Each storage area is built to protect the bars from fire, corrosion, and unauthorized access, and the vault features heavy doors, time locks, and surveillance systems. The bars are kept in conditions that preserve their integrity, and regular inspections help ensure that the recorded inventory matches the physical holdings. The combination of standardized bar size and disciplined storage practices allows the depository to manage one of the largest gold reserves in the world Forbes.
How Gold Bar Dimensions Compare to Other Reserves
The 400-ounce gold bars at Fort Knox are the same size as the bars used in many international central bank reserves and institutional vaults. This consistency makes it easier to transfer and trade gold between countries and financial institutions. Other major gold holders, such as the Federal Reserve Bank of New York and the Bank of England, also store large quantities of gold in similar standard bars. The global gold market relies on these uniform dimensions to streamline clearing, settlement, and verification processes World Gold Council.
While Fort Knox is famous for its gold holdings, the depository is just one part of a broader network of U.S. and international vaults that store gold bars in various sizes. Smaller bars, such as 1-kilogram or 100-ounce bars, are common in the retail and investment market, but the 400-ounce Good Delivery bars dominate wholesale and central bank transactions. The size and security of the Fort Knox vaults reflect the importance of gold as a strategic reserve asset, and the facility continues to play a key role in the global gold market Bank for International Settlements.