SM-6 Blk I/IA vs Sejjil-2: Cost-Exchange Ratio & Combat Analysis
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2026-03-21
3 min read
Overview
This analysis compares the SM-6 Blk I/IA, a US Multi-role BMD/AAW system costing $4.9M per unit, against the Sejjil-2, an Iranian Solid MRBM costing $1.5M per unit. The cost-exchange ratio of 3.3:1 favors the attacker — meaning it costs the defender 3.3x more to intercept than the missile cost Iran to produce. At Operation Epic Fury burn rates of 6/day, the SM-6 Blk I/IA inventory of 750 units faces depletion in approximately 125 days. Multi-mission missile: anti-air warfare, ballistic missile defense, and anti-surface strike Solid-fueled MRBM with 2,000km range — faster launch prep than liquid-fueled variants
Side-by-Side Specifications
| Dimension | Sm 6 Blk I Ia | Sejjil 2 |
|---|
| Unit Cost |
$4.9M |
$1.5M |
| Cost-Exchange Ratio |
3.3:1 |
3.3:1 |
| Range |
Multi-role BMD/AAW |
2000 km |
| Inventory |
~750 |
~300 |
| Annual Production |
165/yr |
— |
| Role |
Multi-role BMD/AAW |
Solid MRBM |
| Manufacturer |
RTX/Raytheon |
Iran / IRGC |
| Fuel |
Solid rocket |
— |
Head-to-Head Analysis
Cost-Exchange Economics
The SM-6 Blk I/IA costs $4.9M per unit while the Sejjil-2 costs just $1.5M, creating a 3.3:1 cost-exchange ratio. Unfavorable for the defender. The attacker has significant cost advantage.
The Sejjil-2 has a 3.3:1 cost advantage over the SM-6 Blk I/IA. This asymmetry is a key factor in the conflict's economic sustainability.
Inventory & Depletion
Coalition forces have approximately 750 SM-6 Blk I/IA interceptors with annual production of 165 units. Iran maintains an estimated 300 Sejjil-2 units. The SM-6 Blk I/IA is already 17% depleted vs operational requirements. At Operation Epic Fury burn rates of 6/day, the SM-6 Blk I/IA inventory of 750 units faces depletion in approximately 125 days.
Coalition holds an inventory advantage, but at 3.3:1 cost ratio, this is offset by economics.
Tactical Engagement
The SM-6 Blk I/IA engages the Sejjil-2 during the flight phase. With 2000km range, the Sejjil-2 can be launched from deep within Iranian territory, complicating launch detection. Triple mission. 200+ fired in Red Sea ops. Only dual AAW+BMD.
The SM-6 Blk I/IA is designed to counter threats like the Sejjil-2, but sustained engagement at 3.3:1 cost ratios creates long-term sustainability challenges.
Scenario Analysis
Mass salvo of Sejjil-2 missiles
In a saturation attack using Sejjil-2 systems, the SM-6 Blk I/IA battery would need to engage multiple targets simultaneously. At $4.9M per interceptor, a salvo of 3 Sejjil-2 missiles would cost $4.5M to launch but $14.7M to intercept.
Sejjil-2
Extended conflict (30+ days)
Over 30 days of sustained combat, the SM-6 Blk I/IA inventory faces significant depletion pressure. Annual production of 165 units translates to just 0.5 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 SM-6 Blk I/IA 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 SM-6 Blk I/IA interceptors for high-value targets.
Overall Verdict
The SM-6 Blk I/IA vs Sejjil-2 matchup produces a 3.3:1 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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