;D
More seriously, though: BattleTech War/JumpShips all fit in one hex, which are generally assumed to be 1.5 inch hexes on a standard map board. This standard includes both the Explorer JumpShip, at a svelte 50,000 tons, to the magnificent behemoth that is the 2,400,000 ton Leviathan II Battleship.
There is no scale.