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.
Frequently Asked Questions
Are the planet stats scientifically accurate?
They follow plausible ranges inspired by real astrophysics, but are randomly generated fiction — not based on any specific known exoplanets.
What does AU mean?
AU stands for Astronomical Unit — the average distance between the Earth and the Sun (about 150 million km). It is used to express planetary distances from their host star.
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