The First One Hundred Hours of War with Iran Cost the U.S. $3.7 Billion 0 40

The main expense was ammunition for strikes against Iran. According to estimates by CSIS experts, during the first 100 hours of the war, U.S. forces used bombs and missiles worth a total of $3.1 billion, as reported by "Meduza".

Some costs, such as the operation of military equipment, had already been accounted for in the defense budget; however, CSIS indicates that primarily, these are off-budget expenses that will likely require additional funding from the Department of Defense—either through supplemental appropriations or through the reallocation of funds.