The United States has spent $38 billion on combat operations against Iran. If the intensity of operations continues, costs could rise by $2–3 billion per month, according to the website infohub.kz.
The calculation includes the cost of replacing expended munitions and lost military equipment, the increase in flight hours, other operations and fuel. The initial intense phase of the conflict lasted just over a month.
Pentagon spending will grow as fighting continues: at the "level of violence" seen in May and June, an additional month would cost about $2 billion, while at July's intensity it would cost $3 billion. If the conflict escalates further, costs could be even higher.
According to the study, in June the US administration asked Congress for $87.6 billion in additional appropriations, of which $67.1 billion was intended for the Pentagon. The portion of the request directly tied to the conflict, $42.3 billion, exceeds the Defense Department's budget office estimate by roughly 10%.
The CBO used government databases and open reports because the Pentagon did not provide the agency with the requested information. As a result, the estimate is "subject to significant uncertainty."