Japan vs United Kingdom Military Comparison
Side-by-side military strength: active personnel, defense budgets, air force aircraft, and naval assets.
Japan
200K active troops
$50B budget
VS
United Kingdom
200K active troops
$70B budget
579
Tanks
227
3,137
Armored Vehicles
5,015
658
Artillery
215
99
Rocket Systems
44
297
Fighter Jets
137
622
Helicopters
332
155
Warships
76
22
Submarines
11
Nuclear Arsenal
United Kingdom
LARGEST
225
WARHEADS
Japan
NON-NUCLEAR
0
WARHEADS
Warheads Over Time
Estimated total warhead inventories — Federation of American Scientists / SIPRI
Defense Budget vs GDP
Historical defense spending and how it compares to each country's GDP. The % of GDP view normalises for economic size so smaller economies aren't drowned out by absolute dollar figures.
Defense Budget Over Time ($B)
Defense Budget as % of GDP
Source: World Bank Open Data API (MS.MIL.XPND.CD)
Military Active Personnel
Japan
LARGEST
247.15K
TROOPS
United Kingdom
62.0% OF LARGEST
153.29K
TROOPS
Japan has 1.61× the active personnel of United Kingdom
Air Force Total Aircraft
Japan
LARGEST
1.45K
AIRCRAFT
United Kingdom
50.6% OF LARGEST
733
AIRCRAFT
Japan has 1.98× the aircraft of United Kingdom
Total Naval Assets
Land Forces — Detailed Metrics
| Metric |
Japan
|
United Kingdom
|
|---|---|---|
| Active Personnel | 247,150 | 153,290 |
| Reserve Personnel | 56,000 | 81,500 |
| Total Military Personnel | 303,150 | 234,790 |
| Defense Budget (USD) | $49,100,000,000 | $68,400,000,000 |
| Tanks | 579 | 227 |
| Armored Vehicles | 3,137 | 5,015 |
| Self-Propelled Artillery | 166 | 89 |
| Towed Artillery | 492 | 126 |
| Rocket Projectors | 99 | 44 |
Air Force — Detailed Metrics
| Metric |
Japan
|
United Kingdom
|
|---|---|---|
| Total Aircraft | 1,449 | 733 |
| Fighters | 297 | 137 |
| Attack Aircraft | 287 | 143 |
| Transport Aircraft | 192 | 288 |
| Trainer Aircraft | 447 | 175 |
| Helicopters | 622 | 332 |
| Attack Helicopters | 119 | 50 |
Naval Forces — Detailed Metrics
| Metric |
Japan
|
United Kingdom
|
|---|---|---|
| Total Naval Assets | 155 | 76 |
| Aircraft Carriers | 4 | 2 |
| Destroyers | 36 | 6 |
| Frigates | 10 | 13 |
| Corvettes | 6 | 0 |
| Submarines | 22 | 11 |
| Patrol Vessels | 6 | 22 |
| Mine Warfare Vessels | 22 | 13 |
See economy, trade, demographics, and more for this comparison.
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Data compiled from World Bank, IMF, Global Firepower, SIPRI, Numbeo, and Pew Research.
Last updated June 2026.
Sources & methodology