SM-3 Block IB vs Fattah-2: Cost-Exchange Ratio & Combat Analysis
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2026-03-21
3 min read
Overview
This analysis compares the SM-3 Block IB, a US Mid-course BMD system costing $15.0M per unit, against the Fattah-2, an Iranian Hypersonic RV costing $3.5M per unit. The cost-exchange ratio of 4.3:1 favors the attacker — meaning it costs the defender 4.3x more to intercept than the missile cost Iran to produce. Earlier-generation midcourse BMD interceptor with unitary kill vehicle Hypersonic glide vehicle warhead on solid-fuel booster, claimed Mach 13+
Side-by-Side Specifications
| Dimension | Sm 3 Block Ib | Fattah 2 |
|---|
| Unit Cost |
$15.0M |
$3.5M |
| Cost-Exchange Ratio |
4.3:1 |
4.3:1 |
| Range |
Mid-course BMD |
1400 km |
| Inventory |
~194 |
~30 |
| Annual Production |
18/yr |
— |
| Role |
Mid-course BMD |
Hypersonic RV |
| Manufacturer |
RTX/Raytheon |
Iran / IRGC |
| Fuel |
Solid rocket |
— |
Head-to-Head Analysis
Cost-Exchange Economics
The SM-3 Block IB costs $15.0M per unit while the Fattah-2 costs just $3.5M, creating a 4.3:1 cost-exchange ratio. Unfavorable for the defender. The attacker has significant cost advantage.
The Fattah-2 has a 4.3:1 cost advantage over the SM-3 Block IB. This asymmetry is a key factor in the conflict's economic sustainability.
Inventory & Depletion
Coalition forces have approximately 194 SM-3 Block IB interceptors with annual production of 18 units. Iran maintains an estimated 30 Fattah-2 units. The SM-3 Block IB is already 20% depleted vs operational requirements.
Coalition holds an inventory advantage, but at 4.3:1 cost ratio, this is offset by economics.
Tactical Engagement
The SM-3 Block IB engages the Fattah-2 during the flight phase. With 1400km range, the Fattah-2 can be launched from deep within Iranian territory, complicating launch detection. CSIS Dec 2025: part of 414 SM-3 total. Reinstated Feb 2026. $475M allocation.
The SM-3 Block IB is designed to counter threats like the Fattah-2, but sustained engagement at 4.3:1 cost ratios creates long-term sustainability challenges.
Scenario Analysis
Mass salvo of Fattah-2 missiles
In a saturation attack using Fattah-2 systems, the SM-3 Block IB battery would need to engage multiple targets simultaneously. At $15.0M per interceptor, a salvo of 1 Fattah-2 missiles would cost $3.5M to launch but $15.0M to intercept.
Fattah-2
Extended conflict (30+ days)
Over 30 days of sustained combat, the SM-3 Block IB inventory faces significant depletion pressure. Annual production of 18 units translates to just 0.0 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-3 Block IB should be integrated into a layered defense architecture, not relied upon as a standalone solution against Fattah-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-3 Block IB interceptors for high-value targets.
Overall Verdict
The SM-3 Block IB vs Fattah-2 matchup produces a 4.3:1 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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