THAAD vs Sejjil-2: Cost-Exchange Ratio & Combat Analysis
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2026-03-21
3 min read
Overview
This analysis compares the THAAD, a US Terminal high-alt system costing $12.7M per unit, against the Sejjil-2, an Iranian Solid MRBM costing $1.5M per unit. The cost-exchange ratio of 8.5:1 favors the attacker — meaning it costs the defender 8.5x more to intercept than the missile cost Iran to produce. At Operation Epic Fury burn rates of 20/day, the THAAD inventory of 384 units faces depletion in approximately 19 days. Terminal High Altitude Area Defense — hit-to-kill interceptor for endo- and exo-atmospheric threats Solid-fueled MRBM with 2,000km range — faster launch prep than liquid-fueled variants
Side-by-Side Specifications
| Dimension | Thaad | Sejjil 2 |
|---|
| Unit Cost |
$12.7M |
$1.5M |
| Cost-Exchange Ratio |
8.5:1 |
8.5:1 |
| Range |
Terminal high-alt |
2000 km |
| Inventory |
~384 |
~300 |
| Annual Production |
96/yr |
— |
| Role |
Terminal high-alt |
Solid MRBM |
| Manufacturer |
Lockheed Martin |
Iran / IRGC |
| Fuel |
Solid rocket |
— |
Head-to-Head Analysis
Cost-Exchange Economics
The THAAD costs $12.7M per unit while the Sejjil-2 costs just $1.5M, creating a 8.5:1 cost-exchange ratio. Unfavorable for the defender. The attacker has significant cost advantage. Iran can produce 8 Sejjil-2 units for the price of a single THAAD interceptor.
The Sejjil-2 has a 8.5:1 cost advantage over the THAAD. This asymmetry is a key factor in the conflict's economic sustainability.
Inventory & Depletion
Coalition forces have approximately 384 THAAD interceptors with annual production of 96 units. Iran maintains an estimated 300 Sejjil-2 units. The THAAD is already 25% depleted vs operational requirements. At Operation Epic Fury burn rates of 20/day, the THAAD inventory of 384 units faces depletion in approximately 19 days.
Coalition holds an inventory advantage, but at 8.5:1 cost ratio, this is offset by economics.
Tactical Engagement
The THAAD engages the Sejjil-2 during the terminal phase. With 2000km range, the Sejjil-2 can be launched from deep within Iranian territory, complicating launch detection. CSIS Dec 2025: 534 pre-June, ~150 fired Jun '25 → ~384 remaining. Target: 400/yr by 2029.
The THAAD is designed to counter threats like the Sejjil-2, but sustained engagement at 8.5:1 cost ratios creates long-term sustainability challenges.
Scenario Analysis
Mass salvo of Sejjil-2 missiles
In a saturation attack using Sejjil-2 systems, the THAAD battery would need to engage multiple targets simultaneously. At $12.7M per interceptor, a salvo of 3 Sejjil-2 missiles would cost $4.5M to launch but $38.1M to intercept.
Sejjil-2
Extended conflict (30+ days)
Over 30 days of sustained combat, the THAAD inventory faces significant depletion pressure. Annual production of 96 units translates to just 0.3 per day — far below consumption rates during active operations. Meanwhile, Iran produces approximately 3.3 ballistic missiles and 6.7 drones per day.
Attacker (Iran) — production outpaces defender replenishment
Complementary Use
The THAAD should be integrated into a layered defense architecture, not relied upon as a standalone solution against Sejjil-2 threats. Cost-effective lower-tier systems (Iron Dome at $80K, or Iron Beam laser at $2/shot) should handle cheaper threats when possible, preserving expensive THAAD interceptors for high-value targets.
Overall Verdict
The THAAD vs Sejjil-2 matchup produces a 8.5:1 cost-exchange ratio favoring the attacker. For sustained conflict planning, interceptor production ramp-up and cost-reduction programs are critical to maintaining defensive capability.
Frequently Asked Questions
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