How does the Roche Limit Calculator work?

Input primary density, satellite density, and mass ratio Then: Calculate rigid or fluid limit depending on satellite type Then: Results show minimum stable orbital distance.

Can you give an example of how to use the Roche Limit Calculator?

Example: Input Earth-Moon: Roche limit ~2.46 Earth radii (within Moon orbit) gives a result of Moon stable but gradually receding (Currently ~384,400 km).

Is the Roche Limit Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Roche Limit Calculator?

Our Roche Limit Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Roche Limit Calculator

Primary Mass (Solar Masses)

Primary Radius (Solar Radii)

Secondary Density (kg/m³)

Roche limit is minimum distance satellite can orbit before tidal forces exceed self-gravity, disrupting it into rings.

Difficulty:advanced

References

›Roche Limit — Wikipedia

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Roche Limit Calculator

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Roche Limit Calculator