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Both calculators run independently — change the inputs on either side to compare results.
Astronomy
Redshift Velocity Calculator
Compute the recession velocity of a nearby galaxy from its redshift z using v = c·z, where c is the speed of light. Part of the Hubble-Lemaître law — the empirical relation that established the expanding universe.
Fill in the required fields to see your result.
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.
Fill in the required fields to see your result.
Key differences
| Redshift Velocity Calculator | Schwarzschild Radius Calculator | |
|---|---|---|
| Category | Astronomy | Astronomy |
| Inputs required | 1 | 1 |
| Result | Recession Velocity (km/s) | Schwarzschild Radius (km) |
| What it does | Compute the recession velocity of a nearby galaxy from its redshift z using v = c·z, where c is the speed of light. Part of the Hubble-Lemaître law — the empirical relation that established the expanding universe. | 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. |