CONFLICTIQ
HEAD TO HEAD

Japan vs United Kingdom

Japan
50%
RAI
United Kingdom
50%

Verdict

Japan and United Kingdom are close to evenly matched, 50–50 on the Relative Advantage Index.

Japan leads on economic size (GDP) (52% of the combined total, $4.0tn) and active personnel (62% of the combined total, 247.0k), which United Kingdom offsets elsewhere.

1 factor — nuclear warheads — could not be scored because the figure is unpublished for at least one side. Those factors are excluded and the remaining weights renormalised, never substituted.

Factor by factor

FactorJapanShareUnited KingdomWeight
Military spending
SIPRI Milex
$62.2bn
41%59%
$89.0bn33%
Economic size (GDP)
World Bank WDI
$4.0tn
52%48%
$3.7tn27%
Active personnel
COW NMC
247.0k
62%38%
150.0k20%
Logistics & power projection
OurAirports
270
50%50%
27220%

Shares are each side's portion of the combined total for that factor. Weights are renormalised across the factors both sides publish — see the methodology. Data read 2026-08-04.

Full Japan dossier →Full United Kingdom dossier →Run a war game →

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Bordering states — the comparisons people actually search for.

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