The US is spending approximately $891 million every day fighting Iran, with the total bill for the conflict's first week alone reaching $6 billion.
The Centre for Strategic and International Studies (CSIS) put the per-day cost at $891.4 million based on Pentagon disclosures about targets struck and assets deployed.
Experts warn the final tally could climb to tens of billions more, even as the war's economic shockwaves ripple far beyond American shores and West Asia.
The US has already spent, in a single week, more than the gross domestic product of many small nations.
The campaign's duration remains deeply uncertain as the Trump administration has offered timelines ranging from two weeks to six weeks.
