Hi,
warseer member Iuris compiled the following list from the Fantasy Flight Games Rogue Trader RPG:
IMPERIAL NAVY and CIVILIAN VESSELS
Grand cruisers:
Avenger - 7.5 km x 1.8 km, 40 mTon, 141.000 crew
Repulsive - 7.4 km x 1.5 km, 39 mTon, 134.000 crew
Exorcist - - 7.3 km x 1.3 km, 37 mTon, 112.000 crew
Battlecruisers:
Overlord - 5.3 km x 0.85 km, 31 mTon, 100.000 crew
Chalice - 5.1 km x 0.8 km, 29 mTon, 98.200 crew
Armageddon - 5 km x 0.8 km, 30 mTon, 98.500crew
Cruisers:
Lunar - 5 km x 0.8 km, 28 mTon, 95.000 crew
Conquest Galleon - 5.1 km x 0.7 km, 30 mTon, 65.000 crew (note: half-transport)
Ambition - 4.9 km x 2 km, 25 mTon, 89.000 crew
Dictator - 5.1 km x 0.8 km, 29 mTon, 85.000 crew (carrier, +15.000 pilots/support personnel)
Light cruisers:
Dauntless - 4.5 km x 0.5 km, 20 mTon, 65.000 crew
Endeavour - 3.8 km x 0.5 km, 22 mTon, 67.500 crew
Defiant - 3.8 km x 0.5 km, 22 mTon, 61.500 crew (carrier, +6.100 pilots/support personnel)
Frigates:
Sword - 1.6 km x 0.3 km, 6 mTon, 26.000 crew
Tempest - 1.5 km x 0.4 km, 6.1 mTon, 30.500 crew
Falchion - 2.2 km x 0.3 km, 6.5 mTon, 28.000 crew
Claymore - 1.4 km x 0.3 km, 5.9 mTon, 21.000 crew
Turbulent - 1.95 km x 0.3 km, 7.5 mTon, 25.000 crew
Raiders:
Hazeroth - 1.5 km x 0.25 km, 5 mTon, 22.000 crew
Havoc - 1.6 km x 0.4 km, 6 mTon, 24.000 crew
Meritech Shrike - 2 km x 0.25 km, 4.5 mTon, 15.000 crew (Heretech vessel)
Iconoclast - 1.3 km x 0.4 km, 6.1 mTon, 16.500 crew (Destroyer)
Viper - 0.95 km x 0.25 km, 4.9 mTon, 7.500 crew
Transports:
Jericho - 2.25 km x 0.3 km, 9 mTon, 20.000 crew
Vagabond - 2 km x 0.4 km, 8 mTon, 18.000 crew
Carrack - 2.1 km x 0.4 km, 8.5 mTon, 19.500 crew (combat adapted)
Goliath - 4.9 km x 0.9 km, 16 mTon, 41.000 crew (onboard plasma refinery)
Universe-class Mass Conveyor - 12 km x 1.3 km, 60 mTon, 60.000 crew (+200.000 to 500.000 passenger capacity)
XENOS VESSELS
Xenos crew numbers are not known. Data like "hordes of boys and grots" is... less than helpful. But amusing. Assume there to be plenty of Orks, and hardly any Eldar.
ORKS
(data will vary due to individualistic nature of the mekboyz)
Hammer Battlekroozer: 4.8 km x 1.2 km, 30 mTon
Kroozer: 4.5 km x 1.1 km, 30 mTon
Attack ship: 1.5 km x 0.4 km, 9.5 mTon
Brute ram ship: 1.1 km x 0.5 km, 6.5 mTon
Rok: repurposed asteroid of up to 4 km
ELDAR
Corsair Eldar:
Shadow cruiser: 4.7 x 1.4 km, 16 mTon
Eclipse cruiser: 4.7 x 1.4 km, 18 mTon
Aurora light cruiser: 3.4 x 0.4 km, 12 mTon
Hellebore frigate: 1.8 x 0.3 km, 5 mTon
Hemlock destroyer: 1.4 x 0.2 km, 4 mTon
Nightshade destroyer: 1.3 x 0.3 km, 4 mTon
Craftworld Eldar:
Shadowhunter escort: 0.8 x .015 km, 3 mTon
Wraithship cruiser: 3 x 0.4 km, 12 mTon
Dragonship cruiser: 4.5-5.5 km x 0.4-0.6 km, 16-20 mTon
RAK'GOL
Butcher transport: 2 x 0.6 km, 9.4 mTon
Mauler frigate: 1.3x 1.0 km, 8.4 mTon
Mangler light cruiser: 3.1 km x 1.2 km, 18 mTon
KROOT
Warsphere battleship: spherical, 9km diameter, 47 mTon, 300.000+ kroot
CHAOS
Soulcage slaveship: 2km x 0.5km, 10 mTon, 30.000 crew + thousands of slaves (captured slave transport)
Hellbringer planetary assault ship (light cruiser): 4km x 0.5 km, 22mTon, 40.000 crew + 100.000 raiders
Devastation cruiser: 5km x 0.8 km, 28.5 mTon, 80.000 crew
Retaliator grand cruiser: 6.2km x 1.4 km, 38 mTon, 140.000 crew
Pestilaan light cruiser:5km x 0.9 km, 39 mTon, 50.000 crew plus "countless lesser demons"
Slaughter class cruiser: 5km x 0.8 km, 28.5 mTon, 80.000 crew
Carnage class cruiser: 5km x 0.8 km, 28.5 mTon, 80.000 crew
Hades class heavy cruiser: 5.2 km x 0.8km, 33.5 mTon, 130.000 crew
Infidel class raider: 1.5km x 0.25 km, 6 mTon, 24.000 crew