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Fat Man
Photo: U.S. Department of Defense · Wikimedia Commons · Public domain Use of this image does not imply endorsement by the U.S. Department of Defense (DoD).
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FatMan

Gravity Bombs · United States · 1945
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FatMan

Fat Man
Fat Man Photo: U.S. Department of Defense · Wikimedia Commons · Public domain Use of this image does not imply endorsement by the U.S. Department of Defense (DoD).
MASS (Military Archive Scoring System) 61
* Absolute score — assessed within category · no era adjustment
Lethality
95
Accuracy
30
Versatility
20
Penetration
40
Reliability
70
Nuclear Capability
100
Platform Compatibility
50
Effect Radius
90
Technology
80
Cost-Effectiveness
40
Methodology ↗ → Gravity Bombs ranking
Origin United States
CategoryGravity Bombs
EraWorld War II
In service1945–1949
Operators1 countries
Quantity120
⬇ Overview
⚙ Specs
⊕ History
⊕ Operators
⚖ MASS Score
📚 Sources
Data Quality85%
MASS(Military Archive Scoring System)
⊟ Gravity Bombsranking ↗methodology ↗
61
Gravity Bombs MASS Rating
1/1
World War II
3/9
All-Time
Gravity Bombs · 10 axes scored
Lethality
95
Accuracy
30
Versatility
20
Penetration
40
Reliability
70
Nuclear Capability
100
Platform Compatibility
50
Effect Radius
90
Technology
80
Cost-Effectiveness
40
ⓘ Regardless of era, the same scoring system applies to all units in the gravity bombs category.
01 / Overview
Fat Man
Category
Gravity Bombs
Country
United States
Production
1945–1949
Quantity
120
Operators
1 countries
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
GRAVITY BOMBS · WORLD WAR II
1
PERFORMANCE/PRICE
35
UNIT COST (2025 USD)
—
MASS SCORE ↗
61
gravity bombs category
ⓘ Performance/Price and MASS score are computed across all units in the gravity bombs category, regardless of era.
02 / Specs & Design
◎General1MOD.1
  • Total Weight4,672.08 kg
◈Warhead Detail1MOD.1
  • Explosive Filler Weight6.2 kg
03 / History
SERVICE LIFESPANStill in Service
  1. 1939First deployment: World War II
  2. 1945Production started
  3. 1949Production ended
81
years in service
4
years in production
120
units produced
1
countries operating
ⓘ The producing country still actively operates it.
04 / Operators
Operator Countries1country
United StatesACTIVE
Gravity Bombs World War II United States
📚 Sources
📖 ENCYCLOPEDIA Browse the Gravity Bombs entry →