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Little Boy
Photo: US Atomic Energy Commission (now US Department of Energy) · Wikimedia Commons · Public domain
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LittleBoy

Gravity Bombs · United States · 1945
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LittleBoy

Little Boy
Little Boy Photo: US Atomic Energy Commission (now US Department of Energy) · Wikimedia Commons · Public domain
MASS (Military Archive Scoring System) 57
* Absolute score — assessed within category · no era adjustment
Lethality
95
Accuracy
30
Versatility
10
Penetration
50
Reliability
70
Nuclear Capability
100
Platform Compatibility
40
Effect Radius
90
Technology
20
Cost-Effectiveness
50
Methodology ↗ → Gravity Bombs ranking
Origin United States
CategoryGravity Bombs
In service1945–1947
Operators1 countries
Quantity9,700
⬇ Overview
⚙ Specs
⊕ History
⊕ Operators
⚖ MASS Score
📚 Sources
Data Quality84%
MASS(Military Archive Scoring System)
⊟ Gravity Bombsranking ↗methodology ↗
57
Gravity Bombs MASS Rating
5/9
All-Time
Gravity Bombs · 10 axes scored
Lethality
95
Accuracy
30
Versatility
10
Penetration
50
Reliability
70
Nuclear Capability
100
Platform Compatibility
40
Effect Radius
90
Technology
20
Cost-Effectiveness
50
ⓘ Regardless of era, the same scoring system applies to all units in the gravity bombs category.
01 / Overview
Little Boy
Category
Gravity Bombs
Country
United States
Production
1945–1947
Quantity
9,700
Operators
1 countries
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
GRAVITY BOMBS
—
PERFORMANCE/PRICE
30
UNIT COST (2025 USD)
—
MASS SCORE ↗
57
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
  • Length3.048 m
◈Warhead Detail1MOD.1
  • Explosive Filler Weight64 kg
03 / History
SERVICE LIFESPANStill in Service
  1. 1945Production started
  2. 1947Production ended
81
years in service
2
years in production
9,700
units produced
1
countries operating
ⓘ The producing country still actively operates it.
04 / Operators
Operator Countries1country
United StatesACTIVE
Gravity Bombs United States
📚 Sources
📖 ENCYCLOPEDIA Browse the Gravity Bombs entry →