US Iran war costs rise as missile interceptor spending mounts

The United States is spending heavily on missile interceptors and other munitions as its conflict with Iran continues, with analysts saying the cost is rising quickly. A report published on Thursday said the Pentagon has been drawing down stockpiles of high-end weapons to defend against Iranian attacks in the Middle East. The war has now been described as costing the United States tens of billions of dollars, with no clear end in sight.

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The report said a single SM-3 interceptor can cost up to $28 million, or about $40 million, and analysts estimate the US may have used more than 100 of them over the past five months. US Defence Secretary Pete Hegseth has put the overall war price tag at $53.6 billion, up from a $25 billion estimate given to the Senate in April. Officials have also said $11.3 billion was spent in the first six days of the conflict alone, underlining how quickly the costs have accumulated.

The spending is not limited to SM-3 missiles. The US military is also reported to be using Patriot missile interceptors and other critical munitions as part of Operation Epic Fury against Tehran. Analysts say the pace of use could take years to replenish, raising concerns about the strain on US readiness for other possible conflicts.

Independent analysts have suggested the true cost may be even higher because the official figures do not include damage to US facilities. The financial burden matters because it reflects both the scale of the confrontation and the pressure on US stockpiles. Missile defence is among the most expensive forms of military activity, especially when interceptors are used repeatedly against ballistic missile threats.

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In this case, the cost is being driven not by a single strike but by sustained defensive operations over months. That makes the conflict a strategic as well as a fiscal issue for Washington. The report also places the war in the context of earlier estimates that have been revised upward as the conflict has continued.

In late June, after the US and Iran agreed to a 60-day ceasefire, the Centre for Strategic and International Studies estimated the conflict had cost the US Department of Defense about $40 billion. The latest Pentagon figure is higher still, suggesting the scale of expenditure has continued to grow even after those earlier assessments. The gap between estimates also shows how difficult it is to measure the full cost of an active conflict.

Nate Swanson, director of the Iran Strategy Project at the Atlantic Council and a former State Department representative on the Trump administration's Iran negotiating team, said the real cost was "certainly much higher". He said the official number mainly covers munitions and does not include damage to US facilities. That distinction matters because it suggests the published totals may understate the wider operational impact of the war.

It also points to the broader economic and military consequences of prolonged missile defence. The conflict has now been described as lasting five months, despite earlier expectations that it would be short. The report said Donald Trump had said the war would last only weeks, but the fighting has continued.

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Analysts say the use of expensive interceptors at this pace could affect the West's military readiness more broadly. That concern is likely to remain central as policymakers weigh the cost of continued defence against Iran. What remains unclear is how long the conflict will continue and whether the current rate of interceptor use will ease.

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