Some baseline measurements, maybe for use with High Guard/Trillion Credit Squadron?
STAR TREK UNIVERSE (Original Timeline)
18 billion tons … Federation Earth Spacedock
750,000 tons … Star Fleet heavy cruiser ship (USS Enterprise NCC-1701)
820,000 tons … Star Fleet Constitution-class ship (Enterprise NCC-1701-A)
570,000 tons … Star Fleet Miranda-class ship (The Reliant)
4.5 million tons … Star Fleet Galaxy-class ship (Enterprise NCC-1701-D)
90 tons … Typical shuttlecraft
45,000 tons … Klingon small Bird of Prey (B’rel class)
415,000 tons … Klingon large Bird of Prey (K’Vort class)
800,000 tons … Klingon battle cruiser (K’t’inga class)
1.3 million tons … Klingon heavy attack cruiser (Vor’Cha class)
90,000 tons … Romulan original Bird-of-Prey
30 million tons … Romulan B-type warbird (D’deridex class)
31 billion tons … Borg Cube
125 million tons … Borg Sphere
STAR TREK UNIVERSE (Kelvin Timeline)
35 million tons … Alt. Star Fleet heavy cruiser (Enterprise NCC-1701)
500 billion tons … Romulan mining ship (Narada)
STAR WARS UNIVERSE
10 tons … Escape pod spaceship (aka “life pod”)
6,000 tons … CR90 Corvette (Tantive IV) (aka “rebel blockade runner”)
8 tons … A-wing fighter
30 tons … B-wing fighter
14 tons … X-Wing fighter
18 tons … Y-Wing fighter/bomber
35 million tons … Imperial Star Destroyer (The Devastator)
6.3 billion tons … Imperial Super Star Destroyer (The Executor)
5 tons … Imperial TIE fighter
7 tons … Imperial TIE Interceptor
10 tons … Imperial TIE advanced fighter (Darth Vader’s ship)
25 tons … Imperial TIE bomber
230 tons … Imperial Lambda-class shuttle
453 trillion tons … Death Star I
1,000 trillion tons … Death Star II
10 billion tons … Cloud City of Bespin
450 tons … Firespray-31-class patrol/attack craft (Fett’s Slave I)
750 tons … Modified Corellian YT-1300 light freighter (Millennium Falcon)
135 million tons … Trade Federation Lucrehulk-class battleship
TRAVELLER UNIVERSE
4 tons … Air/raft
8 tons … GCarrier
20 tons … Ship’s launch spaceship
30 tons … Ship’s boat
40 tons … Pinnace spaceship
50 tons … Modular Cutter
50 tons … Troop transport
90 tons … Typical shuttlecraft
100 tons … Express Boat starship (XBoat)
100 tons … Scout/Courier starship
200 tons … Beowulf-class Free Trader starship
200 tons … Empress Marava-class Far Trader starship
200 tons … Yacht starship
300 tons … Gazelle-class close escort
400 tons … Survey Scout starship
400 tons … Subsidized Merchant starship
400 tons … Patrol Cruiser spaceship
400 tons … System Defense Boat spaceship
400 tons … Fleet Courier starship
600 tons … Subsidized Liner starship
800 tons … Broadsword-class Mercenary Cruiser
1,000 tons … Express Boat Tender spaceship
1,000 tons … Destroyer Escort starship
1,250 tons … Colonial Cruiser starship
3,000 tons … Destroyer starship
5,000 tons … Fleet Escort starship
5,000 tons … Jump ship transport starship
29,000 tons … Light carrier starship
30,000 tons … Light cruiser starship
50,000 tons … Strike cruiser starship
50,000 tons … Armored cruiser starship
50,000 tons … Planetoid monitor starship
60,000 tons … Frontier cruiser starship
75,000 tons … Heavy cruiser starship
75,000 tons … Strike carrier starship
100,000 tons … Fleet carrier starship
500,000 tons … Dreadnaught starship
MARVEL CINEMATIC UNIVERSE
95,000 tons … S.H.I.E.L.D. Helicarrier
150 tons … S.H.I.E.L.D. Quinjet
120 million tons … Chitauri Command Center
2 tons … Chitauri chariot
3,700 tons … Chitauri Leviathan armored creature
550,000 tons … Dark Elf Flagship
900 tons … Dark Elf Harrow ship
190 billion tons … Knowhere (mining colony/severed Celestial head)
3 tons … Knowhere mining pod
45 tons … Nova Corps Star Blaster ship
140 million tons … Kree command warship (The Dark Aster)
47 tons … Sakaaran Necrocraft
38 million tons … Ravager carrier/mothership (The Eclector)
2,700 tons … Ravager Construction ships
450 tons … Ravager Warship
700 tons … Ravager M-ship (The Milano)
1.8 million tons … Nova Corps high security prison station (The Kyln)
ALIENS / PROMETHEUS / PREDATOR UNIVERSE
48 tons … Lockmart Starcub light shuttle (The Narcissus)
95 tons … UD-4L Cheyenne Dropship
45,500 tons … Heliades-class space exploration ship (USCSS Prometheus)
63,000 tons … Lockmart CM-88B Bison M-Class starfreighter (USCSS Nostromo)
78,000 tons … US Colonial Marine Corps. Conestoga-class troop transport
567,000 tons … Engineer’s Derelict (found on LV-426)
145 million tons … Wayland-Yutani Corp. orbital refinery
BATTLESTAR GALACTICA
52 million tons … Battlestar Galactica (1978)
15 tons … Colonial Viper fighter (1978 or 2004)
93 million tons … Cylon basestar (1978)
14 tons … Cylon raider (1978)
41 million tons … Battlestar Galactica (2004)
100 million tons … Cylon basestar (2004)
33 tons … Cylon raider (2004)
OTHER SCI-FI UNIVERSES
5,000 tons … Gallifreyan TARDIS (on the outside)
460,000 tons … Spacing Guild transport
250 billion tons … Spacing Guild Heighliner jumpship
17 million tons … Leviathan transport vessel (Moya)
1,500 tons … Firefly-class transport (The Serenity)
90 tons … Typical shuttlecraft