The financial burden of the US war on Iran has continued to rise sharply, reflecting an intensifying pace of military operations and sustained reliance on advanced weapon systems.
The US Department of Defense initially reported that the cost of the first six days of the war reached $11.3 billion, closely aligning with earlier estimates of $5.6 billion in ammunition expenditure during the opening phase.
By the twelfth day, total costs had surged to over $16.5 billion, driven primarily by the heavy use of precision-guided munitions and air defence systems.
Projected Costs by Day 20
Based on the rate of escalation observed in the early stages of the conflict, estimates indicate that total war expenditure likely exceeded $27 billion by the twentieth day. This projection reflects continued high-intensity operations and sustained deployment of costly advanced weaponry.
Despite this scale of expenditure, the Pentagon has not signalled immediate concerns over ammunition shortages within the current theatre. However, analysts warn that prolonged consumption could significantly impact US military readiness in other strategic regions, particularly the Western Pacific and Ukraine.
Notably, the reported figures exclude the costs of pre-strike military deployments and do not account for infrastructure repair or compensation for losses, suggesting that the true financial burden may be considerably higher.
Breakdown of US Ammunition Usage and Stockpiles
Ship-Launched Missiles
US Navy destroyers and submarines have been heavily engaged in launching Tomahawk cruise missiles against ground targets, while also deploying Standard Missiles for air defence operations.
A key operational limitation remains that naval vessels must return to port once their missile inventories are depleted, as resupply at sea is not feasible.
- Tomahawk Missiles: Approximately 319 missiles were used in the early phase of the war, significantly reducing onboard inventories. The US stockpile, previously estimated at around 3,100 missiles, dropped to roughly 2,700 after the first six days of operations.
- Standard Missiles (SM-3 and SM-6): These systems have been used extensively against ballistic missiles, drones, and cruise threats, with ongoing production planned but insufficient to rapidly offset wartime consumption.
Air and Ground-Launched Systems
Unlike naval assets, air and ground-based systems benefit from more flexible resupply logistics.
- JASSM Missiles: These long-range air-launched missiles have likely formed the backbone of US strike capabilities in the conflict. Stockpiles remain relatively strong at approximately 3,500 missiles, due to sustained procurement over the past decade.
- ATACMS and PrSM: These medium-range systems continue to support ground-based strike operations, with limited but ongoing production of newer variants.
Air Defence Systems Under Pressure
- Patriot Systems: High demand across multiple theatres, including Ukraine and the Western Pacific, has placed significant strain on US inventories.
- THAAD Interceptors: With no new deliveries since 2023 and delayed production timelines, the system faces increasing pressure amid continued ballistic threats.
Additional Munitions
The US continues to rely on a range of air-to-ground munitions such as JDAM, JSOW, and SLAM-ER, which exist in large quantities, alongside newer low-cost unmanned systems like LUCAS, designed to replicate the capabilities of Iranian Shahed drones.
Strategic Implications
The sustained pace of expenditure highlights a growing tension between operational demands and long-term strategic readiness. While US forces retain substantial reserves, the continued depletion of high-end munitions and air defence systems raises concerns about the ability to maintain simultaneous commitments across multiple regions.
The analysis underscores the increasing likelihood that additional Congressional funding will be required to sustain operations and prevent long-term degradation of US military capabilities.
