Navy comparison: 
India vs 
Japan
India's 351-ship navy outnumbers Japan's 158 vessels (2.2:1 advantage).
SEAS (Sea Equipment Aggregate Strength) Index face-off Full ranking →
IndiaWorld #5
55.4
SEAS Index / 100
Japan leads overall, ahead on 3 of 8 categories
JapanWorld #4
61.7
India
Japan
Bars: weighted contribution to the SEAS Index (hulls × category weight) · figures: active hulls at each side's latest inventory year · Methodology
Key figures as of 2026
| India | Japan | Ratio | |
|---|---|---|---|
| Official name | Indian Navy | Japan Maritime Self-Defense Force | |
| Total ships | 351 | 158 | 🇮🇳 2.2× |
| Active ships | 351 | 158 | 🇮🇳 2.2× |
| Submarines | 19 | 23 | 🇯🇵 1.2× |
| Principal surface combatants | 33 | 52 | 🇯🇵 1.6× |
| Aircraft carriers | 2 | 2 | — |
| Amphibious ships | 5 | 3 | 🇮🇳 1.7× |
Show full breakdown · 4 more rowsHide the 4 extra rows
| Corvettes | 23 | 0 | 🇮🇳 |
| Patrol boats | 144 | 6 | 🇮🇳 24× |
| Mine warfare | 0 | 18 | 🇯🇵 |
| Auxiliaries | 125 | 54 | 🇮🇳 2.3× |
Backbone classes one per tier held
Analyst Assessment
Run the wargame simulation →Verdict
Edge: Japan
Japan's Maritime Self-Defense Force holds the overall edge, fielding 52 principal surface combatants and 23 modern submarines against India's 33 and 19, with markedly higher average unit quality despite a much smaller hull count. India offsets this with genuine fixed-wing carrier aviation, nuclear-powered submarines and a far wider basing network across the Indian Ocean.
Domain by domain
Surface combatants
Edge: Japan
🇮🇳 India33 principal combatants: 13 destroyers led by four Visakhapatnam-class, 20 frigates including eight Talwar-class, plus 23 corvettes. BrahMos-armed, Barak-8 equipped, but a mixed Russian-Indian-Western fleet with uneven sensor commonality.
🇯🇵 Japan52 principal combatants: 42 destroyers, including nine Murasame-class and eight Aegis ships, plus ten new Mogami-class frigates. Homogeneous, US-interoperable combat systems and strong area air and missile defence depth.
Submarines
Edge: Japan
🇮🇳 India19 boats spanning six Kilo-class, Scorpene-derived Kalvari boats and indigenous nuclear-powered units, giving India a strategic and nuclear-propelled dimension Japan lacks, but with ageing conventional hulls and slow build tempo.
🇯🇵 Japan23 conventional boats, twelve Sōryū-class with AIP and lithium-ion batteries plus successor Taigei units, built on a steady one-boat-per-year cycle. Exceptional quieting and crew proficiency, but no nuclear propulsion or strategic role.
Carriers & naval aviation
Edge: India
🇮🇳 IndiaTwo carriers, Vikramaditya-class and the indigenous Vikrant, operating MiG-29K fixed-wing squadrons from ski-jump decks. Sustained operational experience in launching and recovering combat aircraft at sea.
🇯🇵 JapanTwo Izumo-class ships, designed as helicopter destroyers and progressively modified for F-35B operations. Strong rotary-wing and ASW aviation, but shipborne fixed-wing capability is still maturing.
Bases & reach
Edge: India
🇮🇳 IndiaFifteen bases on file, from INS Kadamba on the west coast to island facilities at Kardip and Jarawa, covering both Indian Ocean seaboards and the Andaman approaches to the Malacca Strait.
🇯🇵 JapanSix bases: Yokosuka, Sasebo, Kure, Maizuru, Ōminato and Djibouti. Dense home-island coverage of the first island chain, with alliance access offsetting limited organic overseas infrastructure.
Coastal & mine warfare
Edge: Japan
🇮🇳 IndiaNo dedicated mine warfare hulls in the inventory; littoral tasks rest on 144 patrol craft, largely Solas Marine interceptors, Car Nicobar and Sukanya types, suited to constabulary work rather than mine clearance.
🇯🇵 Japan18 mine warfare vessels including six Sugashima-class, a long-standing national specialism reflecting dependence on open sea lanes and narrow straits. Only six Hayabusa-class patrol craft, indicating a deliberately narrow coastal focus.
Wildcards
- Alliance access and interoperability Japan's fleet is built around interoperability with US forces and shared basing on the home islands, extending effective reach well beyond six bases. India operates largely independently, with access arrangements rather than treaty guarantees.
- Industrial depth and tempo Japan sustains a predictable submarine and frigate production cadence with domestic yards and mature supply chains. India's indigenous programmes have delivered Vikrant and Visakhapatnam hulls but face longer timelines and imported-component dependence.
- Geography of the task India faces a two-seaboard Indian Ocean theatre demanding endurance and expeditionary presence. Japan confronts a compressed, contested first island chain where ASW, mine warfare and air defence dominate. Force designs answer different problems.
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Editorial assessment produced from the figures on this page and public sources; it is an informed reading, not a military assessment or a prediction.
Frequently Asked Questions
Which country has more naval ships, India or Japan?
India has a larger navy with 351 ships compared to Japan's 158 ships.
Which navy has more submarines, India or Japan?
Japan operates more submarines with 23 compared to India's 19.
Which country has more aircraft carriers, India or Japan?
Japan has 2 aircraft carrier(s) compared to India's 2.
Which navy has more destroyers, India or Japan?
Japan operates 42 destroyers compared to India's 13.
Which navy has more frigates, India or Japan?
India operates 20 frigates compared to Japan's 10.
How do the India and Japan navies compare in size?
India's navy is 2.2 times larger than Japan's in terms of total ships (351 vs 158).