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The United States has spent roughly $3.7 billion in just the first 100 hours of its war against Iran.

Getting into it: According to the Center for Strategic and International Studies, the largest portion of the early cost comes from munitions replacement. US forces are estimated to have fired more than 2,000 weapons during the first several days of the campaign, including cruise missiles, precision-guided bombs, and other strike systems used to hit Iranian targets. Replenishing those weapons alone is estimated to cost roughly $3.1 billion. Early strikes relied heavily on expensive long-range standoff weapons such as Tomahawk cruise missiles, which cost about $3.6 million each, as well as other advanced precision weapons launched from aircraft and naval vessels.

Another major category of spending involves missile defense systems used to intercept Iranian missiles and drones. Iran has launched hundreds of ballistic missiles and thousands of drones during the conflict, forcing the United States and its allies to deploy advanced air defense systems to protect bases, ships, and regional infrastructure. Interceptors used by systems such as the Patriot and THAAD platforms are extremely expensive, often costing millions of dollars each. Analysts estimate that the cost of missile defense munitions used in the first 100 hours could reach roughly $1.7 billion, although the precise figure is uncertain because regional allies have also intercepted a large number of incoming threats.

Equipment losses and infrastructure damage represent another portion of the financial toll. One of the most significant confirmed losses was the destruction of three F-15 fighter jets in a friendly fire incident over Kuwait. Each aircraft costs about $103 million to replace, bringing the total replacement cost to roughly $309 million. Iranian missile and drone strikes have also caused damage to US military facilities in the region, including infrastructure in Kuwait and Qatar. Repairing those installations is estimated to add another $50 million to the overall cost, bringing total equipment and infrastructure losses to roughly $359 million.

Beyond weapons and losses, the Pentagon is also paying for the day to day cost of running the campaign through operations and support spending. These expenses include flying combat missions, deploying naval fleets, maintaining equipment, transporting supplies, and compensating personnel for extended deployments and hazard pay. Air operations alone cost more than $125 million during the first 100 hours and are expected to add about $30 million per day as the conflict continues. Naval operations supported by aircraft carriers, destroyers, and other ships operating in the region cost another $64 million during the same period and add roughly $15 million per day.

This all comes as reports indicate that the Pentagon is preparing to seek up to $50 billion in additional funding to supplement the cost of the war with Iran.