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A size class is a numerical scale for rating the relative sizes and capabilities of ships. Two different size class ratings have been created for licensed Star Trek works.


FASA's scale comes from its RPG's Ship Construction Manual, and rates ships in terms of their mass in metric tons. It is merely an indicator of size/mass. Combat Efficiency was a separate rating to compare relative combat strengths.

  • Class: Mass (mt)
    • I: 0-5
    • II: 5-15
    • III: 15-25
    • IV: 25-40
    • V: 40-60
    • VI: 60-80
    • VII: 80-100
    • VIII: 100-120
    • IX: 120-140
    • X: 140-160
    • XI: 160-180
    • XII: 180-210
    • XIII: 210-240
    • XIV: 240-300
    • XV: 300-350
    • XVI: 350-400
    • XVII: 400-450
    • XVIII: 450-500
    • XIX: 500-600
    • XX: 600-700

DS9 video game: Dominion Wars

The Dominion Wars computer game used a much simpler scale, from Class-1 to Class-5, which was much more specialized towards particular combat vessels:

Starship classification
By type argosyassault cruiserassault shipattack cruiserattack fighterbattlecruiserbattle frigatebattleshipbird-of-preybombercargo transportcarriercolony shipcombat support tendercommand battlecruiserconstruction shipcorsaircorvettecouriercruisercutterdestroyerdreadnoughtescortexplorerfast attack shipfast cruiserflagshipfreighterfrigatefuel shipgunboatheavy cruiserheavy destroyerheavy escorthospital shipin-system courierliaison cutterlight cruiserlight frigatemedical frigatemedium cruisermining freightermissile cruisermonitormulti-mission explorerpassenger linerpatrol cruiserpersonnel carrierpilot escortprison bargerepair tenderresearch vesselresearch cruiserrunaboutscoutsleeper shipstar battleshipstar cruiserstrike cruisersuper carriersuper-heavy cruisersupport frigatesurveyortankertendertimeshiptransporttugwarbirdwarpshuttleweapon ship