Download size

How many GB is Stellaris?

10 GB

That makes it bigger than 77% of Real Time Strategy (RTS) games we have measured.

The median Real Time Strategy (RTS) game needs 3 GB; the largest tenth start at 20 GB.

Leave at least 17 GB free: games need headroom to unpack updates.

The figure is the storage Steam lists as required for this game, not a measured download.

Stellaris is a real-time 4X grand strategy game set in a procedurally generated galaxy. Players control an interstellar civilization, exploring star systems connected by hyperlane networks, colonizing habitable worlds, and managing their empire's economy across resources like energy, minerals, and alloys. The game emphasizes empire customization through species traits, ethics, government types, and civics that shape both aesthetics and mechanics. Gameplay progresses through diplomacy, trade, and warfare with other civilizations, while mid-game and late-game galactic crises introduce escalating threats such as extragalactic invasions or hostile artificial intelligence awakenings. Players can pursue ascension paths including genetic engineering, cybernetic augmentation, or psionic abilities. Originally released for PC, the game later received a console edition and has been supported with numerous expansions adding megastructures, new empire types, espionage mechanics, and additional crisis scenarios.