The numbers coming out of Washington right now are staggering. The United States’ military operation against Iran — codenamed Operation Epic Fury — has already cost an estimated $3.7 billion in just its first 100 hours. That works out to nearly $891 million per day, and the most alarming part? The vast majority of that spending was never planned for in the federal budget.

The $3.7 Billion Bill — Broken Down

Cost Category	Amount	Budgeted?
Total cost (first 100 hrs)	$3.7 billion	Mostly NO
Daily burn rate	~$891.4 million/day	—
Operational costs	~$196 million	Mostly YES ($178M)
Munitions replacement	~$3.1 billion	❌ None budgeted
Combat losses & repairs	~$350 million	❌ Not budgeted
Air-defence interceptors	~$1.7 billion	❌ Not budgeted
Infrastructure repairs	~$50 million	❌ Not budgeted
Total unbudgeted costs	$3.5 billion	❌

Source: Center for Strategic and International Studies (CSIS)

What Is Operation Epic Fury?

On 28 February 2026, the United States and Israel began coordinated joint attacks on various sites across Iran, codenamed Operation Roaring Lion by Israel and Operation Epic Fury by the United States, targeting key Iranian officials, military commanders, and nuclear and military facilities. India.com

To understand the full scope of this conflict, see the detailed breakdown on the 2026 Iran war Wikipedia page.

Among the 2,000+ precision munitions fired in the opening phase were an unknown number of Tomahawk cruise missiles, which cost more than $2 million each — making munitions replacement by far the single largest cost driver of the entire operation.

The Political Firestorm Back Home

CSIS researchers Mark Cancian and Chris Park warned that the unbudgeted costs would likely require the Pentagon to seek a supplemental appropriation — similar to what the George W. Bush administration did at the beginning of the Iraq and Afghanistan wars — and that this funding gap could become “a focal point for opposition to the war.”

Rising gas prices, domestic inflation, and cost-of-living pressures are already eroding public support for the conflict among American citizens, splitting the Trump administration’s America First base — who were promised no involvement in foreign wars.

Defense Secretary Pete Hegseth stated on March 4: “We are just getting started” — signalling an escalation ahead that would push costs even higher.

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FAQs

Q: How much has the US spent on the Iran war in the first 100 hours?

According to the CSIS think tank, the US spent approximately $3.7 billion — or $891.4 million per day — in the first 100 hours of Operation Epic Fury, with $3.5 billion of that being completely unbudgeted.

Q: Will the US government need extra funding to continue the Iran war?

Yes — CSIS analysts warn the Pentagon will need to request a supplemental appropriation from Congress, as the level of internal budget cuts required to fund the conflict would be “politically and operationally difficult.”