Stellaris starbase capacity defines how many ships, districts, and modules you can maintain from a single hub. Understanding these limits helps you plan fleet composition and defend critical choke points.
This guide breaks down the mechanics, adjustments, and optimization tactics related to starbase capacity in a clear, actionable way.
| Capacity Type | Base Value | Key Modifier | Effective Range |
|---|---|---|---|
| Ship Slots | 40 | Starbase Modules | 40–200+ |
| District Slots | 6 | District Specialization | 6–12 |
| Module Slots | 4 | Block Size & Fortifications | 4–8 |
| Fleet Supply Limit | 2000 | Starbase Level | 2000–10000+ |
Starbase Module Layout and Capacity Scaling
How Module Placement Affects Total Capacity
The arrangement of modules directly determines starbase capacity. Each block added increases hitpoints and expands possible module slots, which in turn raises ship and fleet supply limits.
Strategic placement around gravity wells ensures that reinforcements arrive quickly and that logistical penalties stay minimal across your sectors.
Fleet Supply and Level Progression
Increasing Starbase Level for Higher Limits
Starbase level is the backbone of capacity growth. As level increases, fleet supply, module slots, and overall durability scale substantially.
Upgrading to higher tiers requires rare resources and empire approval, but the resulting capacity jump is essential for late-game dominance.
Territory Block Size and District Management
Optimizing Districts Around Starbase Modules
District specialization changes how starbase capacity is used. Weapon districts add firepower while economy districts boost recovery and reinforcement speed.
Balancing district count with the base six slot limit allows you to tailor the starbase to defensive or offensive roles without breaking logistical flow.
Adjustments from Ruler Traits and Civics
Passive Bonuses that Reshape Capacity
Ruler traits and civic selections can significantly increase starbase capacity before you even place a module. These bonuses apply across your entire empire, stacking with traditional upgrades.
Choosing admiralty traditions or centralized logistics can make early starbases competitive with fully upgraded late-game installations.
Key Takeaways and Recommendations
- Prioritize module placement that maximizes fleet supply while minimizing maintenance costs.
- Choose ruler traits and civics that boost starbase capacity before investing in expensive modules.
- Balance weapon and economy districts to match your strategic goals in each gravity well.
- Plan upgrades ahead of crises so your starbases can support large fleets without bottlenecking reinforcement.
FAQ
Reader questions
Does starbase capacity affect travel speed through gravity wells?
No, starbase capacity does not alter travel speed, but higher fleet supply reduces supply drain, helping your fleets remain active longer while transiting regions.
Can I exceed the default ship slot limit without modifying the starbase? Not directly; you must add modules that provide extra ship slots or use empire-level modifiers to push beyond the base ceiling of forty ships. Are district slots shared between multiple starbases in the same system?
No, each starbase maintains its own separate district slot count, so spreading districts across starbases is necessary to maximize coverage.
Do bot empires ever struggle with starbase capacity in endgame crises?
Yes, aggressive bot empires can outgrow early starbases during endgame crises if they fail to upgrade modules, leaving them vulnerable to large enemy fleets.