Random Planet Generator
Generate random fictional planets with complete stats — type, atmosphere, gravity, moons, temperature, and habitability — for sci-fi writing and tabletop RPGs.
Last updated: May 31, 2026
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Buy me a coffeeWhat is Random Planet Generator?
Building a science-fiction universe requires planets with distinct, internally consistent characteristics. This generator creates fictional planets with a randomised name, classification type, atmospheric composition, day and year length, surface temperature range, number of moons, gravity, and a habitability assessment.
Types range from Terrestrial and Ocean worlds to Gas Giants, Frozen wastelands, and Toxic hellscapes — giving you the full variety of a real star system.
How to Use Random Planet Generator
Select a planet type or leave on "All".
Set how many planets to generate.
Click "Generate".
Copy individual planet names or all results.
Common Use Cases
- Building star systems for sci-fi novels, screenplays, or games.
- Creating planets for tabletop RPG campaigns (Starfinder, Stars Without Number, etc.).
- Generating encounter locations for space-based adventures.
- Brainstorming settings for short stories and world-building exercises.
Example Input and Output
A random Ocean planet.
OceanVelora 4 — Ocean — 2.3 AU — 1.1g — Nitrogen-Oxygen with high humidity — −10°C to 45°C — 2 moons — Highly habitableData Privacy
All planets are generated locally in your browser.