Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Habitable Zone Calculator
Estimate the inner edge of a star's habitable zone in AU based on its luminosity relative to the Sun. Helps astronomers and enthusiasts identify where liquid water could exist on a planet's surface.
Fill in the required fields to see your result.
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.
Key differences
| Habitable Zone Calculator | Planetary Mass Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 1 | 2 |
| Result | Inner Habitable Zone (AU) | Central Mass (M☉) |
| What it does | Estimate the inner edge of a star's habitable zone in AU based on its luminosity relative to the Sun. Helps astronomers and enthusiasts identify where liquid water could exist on a planet's surface. | 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. |