The United States has already spent more than $27 billion on its military operation against Iran—according to estimates by the monitoring project Iran War Cost Tracker.
The calculations are based on Pentagon data: spending reached $11.3 billion in the first six days of the conflict, after which daily costs are estimated at roughly $1 billion.
At the same time, the estimate likely excludes certain associated costs—particularly expenses related to force deployment and equipment replenishment—meaning the true total may be higher.