Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Planetary Mass Calculator
Determine the mass of a star or planet in solar masses from a satellite's orbital period and semi-major axis. Useful for astronomers and students applying Kepler's third law to real or hypothetical systems.
Fill in the required fields to see your result.
Astronomy
Escape Velocity Calculator
Find the minimum speed an object must reach to escape a celestial body's gravity without further propulsion. Essential for mission planning, planetary science, and understanding why some atmospheres are retained.
Fill in the required fields to see your result.
Key differences
| Planetary Mass Calculator | Escape Velocity Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 2 | 2 |
| Result | Central Mass (M☉) | Escape Velocity (km/s) |
| What it does | Determine the mass of a star or planet in solar masses from a satellite's orbital period and semi-major axis. Useful for astronomers and students applying Kepler's third law to real or hypothetical systems. | Find the minimum speed an object must reach to escape a celestial body's gravity without further propulsion. Essential for mission planning, planetary science, and understanding why some atmospheres are retained. |