Capital ship

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The capital ships of a navy are its "important" warships; the ones with the heaviest firepower and armor. There is usually no formal criterion for the classification, but it is a useful concept when thinking about strategy, for instance to compare relative naval strengths in a theater of operations without having to get bogged down in the details of tonnage and gun diameters. A capital ship is generally a leading or a primary ship in a fleet.

In the 20th century, especially in World Wars I and II, typical capital ships would be battleships, battlecruisers, and in WWII, aircraft carriers (though it took until late 1942 for carriers to be universally considered capital ships). All of the above ships were close to 20,000 tons displacement or heavier. Heavy cruisers, despite being important ships, were not considered capital ships. During the Cold War, a Soviet Kirov class battlecruiser had a displacement great enough to rival WWII-era capital ships, perhaps defining a new battlecruiser for that era. In the 21st century, the aircraft carrier is the last remaining capital ship, (Ballistic Missile Submarines possibly another contender) with firepower defined in decks available and aircraft per deck, rather than in guns and calibres. The United States has undeniable supremacy in both categories of aircraft carriers, possessing not only 11 supercarriers each capable of carrying and launching nearly 100 tactical aircraft, but an additional 12 amphibious assault ships every bit as capable (in the "sea control ship" configuration) as the light VSTOL carriers of other nations.

The definition of "capital ship" was formalized in the limitation treaties of the 1920s and 30s; see Washington Naval Treaty, London Naval Treaty, and Second London Naval Treaty.

Before the advent of the all-steel navy in the late 19th century, a capital ship was a warship of the First, Second or Third rates:

1st Rate: 100 or more guns, typically carried on three or four decks. Four-deckers tended to have problems with the waterline and the lowest deck could seldom fire except on the calmest of seas.
2nd Rate: 90-98 guns
3rd Rate: 64 to 80 guns (although 64-gun third-raters were very small and not very numerous in any era).

Frigates were ships of the fourth or fifth rate; a corvette was a ship of the sixth rate.

Capital ships in fiction and popular culture

In most military science fiction universes, capital ships are considered to be warships of frigate-size or larger.

In the Star Wars universe, "capital ship" refers to any starship at least 100 meters long.

In the Battlestar Galactica universe, Battlestars are large spacegoing capital ships that function similar to aircraft carriers.

In the computer game StarCraft, capital ships are considered to be Terran Battlecruisers or Protoss Carriers.

In the computer game series Homeworld, capital ships are classified as producable ships (non-flagships) that are significantly more important and expensive than other, smaller ships, whether in combat or in ship production. Examples are the carrier (mobile base for frigate, fighter, and utility ship production), the shipyard (almost-immobile production facility that can manufacture even the largest ships), and the destroyer, the battlecruiser, and the juggernaught, all formidable anti-capital ship or anti-frigate warships.

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