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Memory Beta, non-canon Star Trek Wiki
Memory Beta, non-canon Star Trek Wiki

Mark and tier were systems for rating equipment, initially employed by Starfleet and adopted by allied governments in the 2400s decade. Mark ratings were expressed in Roman numerals. (ST video games: Star Trek Online, Trexels)

History and specifications[]

During the investigation of the Trexelian Expanse, Starfleet rated ships it deployed, that it encountered in battle, by tiers. Space stations of Starfleet battle groups, like Battle Group 1, supported ships from the same or lower tiers. (ST video game: Trexels, "Skirmish" mode)

By the year 2409, Starfleet rated ships in tiers 1 to 5, and equipment from mark I upwards. Tier 1 and mark I were the lowest rating. Variations included upgraded vessels, rated Tier 2U, Tier 3U, up to T5U. Fleet was an additional rating for ships on Tier 5 that outcompeted their basic counterparts. At the time, the tier-level also indicated the minimum rank to command a starship, with a lieutenant restricted to tier 1, and rear admiral, lower half required for tier 5. (STO - Tutorial mission: "Assimilation of the Innocent")

For Operation Delta Rising, the Federation and its allies from the Klingon Empire and Romulan Republic added Tier 6 in 2410. All ship classes launched from that year onward were rated tier 6, and existing older classes received refit and retrofit versions with that rating. Some individual T5-rated ships could be upgraded to Tier 5-X. The rank of vice admiral or higher was required from a commanding officer. (STO - Delta Rising mission: "Mindscape", STO Issue 07: "USS Pathfinder")

In 2411, ships that had been rated tier 6 had their rank restriction removed, allowing commanding officers of any rank to assume command. The highest equipment rating at the time was Mark (Mk) XV. (STO - Legacy mission: "Measure of Morality (Part 1)")


In the 25th century, the Khitomer Alliance military forces equated starhip tier rating, equipment mark rating and rank. The system was shared between Federation Starfleet, Klingon Defense Force, Romulan Republic Navy, and the Jem'Hadar Vanguard Fleet of the Dominion. (STO - Klingon War missions: "Welcome to Earth Spacedock", "The Hunt Is On", "Explore the Flotilla")


starship tier equipment mark Starfleet rank KDF rank RRN rank Vanguard rank
Tier 1 Mk I-II cadet, ensign, lieutenant junior grade, lieutenant warrior, lieutenant citizen, lieutenant fifth, fourth
Tier 2 Mk III-IV lieutenant commander lieutenant commander centurion third
Tier 3 Mk V-VI commander commander subcommander second
Tier 4 Mk VII-VIII captain captain commander first
Tier 5 Mk IX-X rear admiral, lower half brigadier general subadmiral I master first
Tier 5-U Mk XI-XII rear admiral, upper half major general subadmiral II senior first
Tier 5-U Mk XIII-XIV vice admiral, admiral lieutenant general, general vice admiral, admiral elite first, revered first
Tier 6 Mk XV fleet admiral dahar master fleet admiral honored first


External links[]