Claude is down, so I had to make use of Grok to estimate how long it will take for US and Israeli air defense systems to run out of interceptors. No precise calculation is possible, especially since the in-theater total is a subset of the entire US stock, but it appears obvious that both the USA and Israel will be effectively unable to defend against missile barrages by this time next week at the latest.
US Interceptor Exhaustion Timeline
US systems (THAAD, SM-3, Patriot PAC-3 MSE) are primarily defending Israel, Gulf allies, and regional bases. At 800 interceptors/day total (with US contributing ~50–70% based on 2025 shares), high-end systems risk faster depletion.
- THAAD: Estimated remaining stockpile ~450–550 units (after 2025 depletion of ~150 and partial resupply of ~50–100). At a proportional daily rate (~100–150 expended/day in high-tempo scenarios, per 2025 precedents), exhaustion could occur in 3–5 days. Full depletion might force reliance on less optimal systems like Patriot for ballistic threats.
- SM-3: Remaining stockpile ~350–450 units (post-2025 expenditure of ~130–160, with ~70–100 delivered since). At ~80–120/day in sustained naval defense, depletion projected in 3–6 days, potentially exposing carriers and bases in the Mediterranean/Red Sea.
- Patriot (PAC-3 MSE): Larger inventory (~10,000–12,000 total, though deployed stocks lower at ~2,000–3,000 in theater). Production at ~600–650/year supports longer sustainability, but at ~200–300/day for medium-range threats, could last 1–2 weeks before critical shortages emerge.
- Overall Projection: High-end US interceptors could exhaust in 3–7 days at this rate, shifting strategy toward preemptive strikes on Iranian launchers (as seen in current operations) or drawing from Pacific/European reserves, risking vulnerabilities elsewhere (e.g., vs. China).
Israel Interceptor Exhaustion Timeline
Israel’s layered systems (Iron Dome, David’s Sling, Arrow 2/3) were depleted in 2025 (~35% of ballistic stocks destroyed by Israel, but own interceptors heavily used). Production has accelerated (e.g., Arrow 3 tripled), but costs (~$2M–$3M per Arrow, $40K–$50K per Iron Dome Tamir) and lead times constrain resupply.
- Iron Dome: Focuses on short-range rockets/drones; undisclosed stock but replenished post-2025. At high rates (~300–400/day), could deplete in 2–4 days without US support.
- David’s Sling: Medium-range; expanded role, but limited details. Proportional depletion in 3–5 days under barrage.
- Arrow (2/3): Ballistic defense; low post-2025 (~200–300 remaining estimated). At ~100–200/day for high-threat salvos, exhaustion in 1–3 days.
- Overall Projection: Israeli stocks could last 2–5 days at the adjusted rate, prompting aggressive offensives (e.g., “Operation Roaring Lion” targeting Tehran) to reduce incoming threats. Gulf allies (e.g., UAE intercepting ~165 ballistics by March 1) add buffer but face similar strains.
Claude is back up and here are its estimates:
ROUGH AGGREGATE (Feb 28 – March 1):
| Launched at target | Intercepted | Got through | |
|---|---|---|---|
| UAE | ~708 | ~660 | ~48 |
| Kuwait | ~380 | ~370+ | ~10+ |
| Qatar | ~77 | ~65+ | ~3+ |
| Bahrain | ~54 | ~50+ | several |
| Jordan | ~49-54 | ~49+ | ~1+ |
| Israel | dozens BMs + 50+ drones | most | several BMs |
| Saudi Arabia | unknown | unknown | some debris/impacts |
| Iraq/Erbil | dozens | most | several |
| Oman | 2+ | 0 | 2+ |
Estimated total: roughly 1,400-1,500+ projectiles launched by Iran across all theaters in ~36-48 hours, with the vast majority intercepted but a significant number — perhaps 70-100+ — making impact. At least 14 people killed outside Iran (10 in Israel, 3 in UAE, 1 in Kuwait, 1 in Bahrain) plus 4 US service members, with hundreds injured.
So how does this impact the interceptor stocks?
Let me tally up the interceptions and apply the 2-3 interceptors per target doctrine.
Total interceptions across all theaters in ~36-48 hours: roughly 1,200-1,300+
At 2 interceptors per intercept: 2,400-2,600 interceptors consumed At 3 interceptors per intercept: 3,600-3,900 interceptors consumed
And we estimated total coalition stockpile at roughly 2,000-2,500 interceptors of all types.
The numbers don’t work – even at the lower consumption rate, we’re looking at depletion that exceeds available inventory, and the higher estimate pushes well beyond what’s realistically in the arsenal.
Interceptors consumed in 36-48 hours:
From the tally we just compiled, coalition forces across all theaters intercepted roughly 1,200-1,300 projectiles. Applying the doctrinal requirement of 2-3 interceptors per target:
- At 2 per intercept: 2,400-2,600 interceptors consumed
- At 3 per intercept: 3,600-3,900 interceptors consumed
Now, not every intercept uses the same type of system. Drones are cheaper to kill — some can be shot down by fighter jets, helicopters, or even gun-based systems like the Phalanx CIWS that don’t consume expensive interceptor missiles. The IDF confirmed that fighter jets, helicopters, and air defense systems all contributed to shooting down the 50+ drones targeting Israel. Gulf states likely used a mix of systems as well.
So let’s be generous and assume that roughly half the drone intercepts were handled by aircraft or cheaper systems rather than missile interceptors, while all ballistic missile intercepts required full interceptor expenditure. Working from the aggregate numbers:
Ballistic missiles intercepted across all theaters: roughly 400-500 (UAE alone accounted for 152, Kuwait 97, Qatar and Bahrain another 60+, Jordan ~50, Israel dozens more). At 2 interceptors each, that’s 800-1,000 high-end interceptors consumed — THAAD, SM-3, Arrow, Patriot PAC-3.
Drone/cruise missile intercepts requiring missile interceptors (assuming half of ~800 drone intercepts used missiles): roughly 400, at perhaps 1-2 interceptors each. That’s another 400-800 interceptors, mostly Patriot and shorter-range systems.
Conservative total: roughly 1,200-1,800 interceptor missiles consumed in under two days.
Recall our earlier estimates of what was available entering this conflict:
- THAAD: ~500-520 interceptors
- SM-3: ~350-380
- Patriot PAC-3 (in theater): ~960-1,440
- Israeli systems (Arrow, David’s Sling): classified but already described as low
That’s a combined pool of roughly 2,000-2,500 high-end interceptor missiles, which we noted was already depleted from the June 2025 war and only partially replenished.
If 1,200-1,800 have been consumed in two days, the coalition has burned through roughly 50-75% of its entire available interceptor inventory in the opening 48 hours alone.
Perhaps 700-1,300 interceptor missiles of all types remain across all theaters — the US homeland, the Pacific, Europe, and the Middle East combined. That’s not just the Middle East stockpile; that’s global. The US military operates only eight THAAD batteries in its entire arsenal CSMonitor.com, and they cover commitments from South Korea to Guam to Europe. Every THAAD interceptor fired in the Middle East is one unavailable if North Korea or China acts.
At the current consumption rate of 600-900 interceptors per day, the remaining stock covers roughly 1-2 more days of defense at this intensity before reaching levels that would be considered operationally catastrophic — meaning commanders would have to begin rationing, choosing what to defend and what to leave exposed.
This is exactly the scenario analysts warned about. If Iranian forces sustain high-volume launches, coalition planners may confront zero-sum decisions in which defending one theater necessarily increases exposure in another. Defence Security Asia We’re now looking at that scenario playing out in real time.
Iran has spent perhaps 1,500 projectiles out of a combined drone and missile inventory of 80,000+. The coalition has spent perhaps 1,500 interceptors out of a total inventory of 2,500. Iran has consumed roughly 2% of its available munitions. The coalition has consumed roughly 60% of its available interceptors.

