Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Stellar Luminosity Calculator
Compute a star's luminosity in solar units (L☉) from its radius and surface temperature via the Stefan-Boltzmann law. The fundamental relationship between stellar size, temperature, and total energy output — and the basis of the Hertzsprung-Russell diagram.
Astronomy
Schwarzschild Radius Calculator
Compute the Schwarzschild radius — the event horizon size of a non-rotating black hole — from its mass via r_s = 2GM/c². The defining length scale of black holes, equal to about 3 km per solar mass.
Key differences
| Stellar Luminosity Calculator | Schwarzschild Radius Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 2 | 1 |
| Result | Stellar Luminosity (L☉) | Schwarzschild Radius (km) |
| What it does | Compute a star's luminosity in solar units (L☉) from its radius and surface temperature via the Stefan-Boltzmann law. The fundamental relationship between stellar size, temperature, and total energy output — and the basis of the Hertzsprung-Russell diagram. | Compute the Schwarzschild radius — the event horizon size of a non-rotating black hole — from its mass via r_s = 2GM/c². The defining length scale of black holes, equal to about 3 km per solar mass. |