Schwarzschild Radius (Black Hole) Calculator
Calculate the black hole event horizon radius of a mass.
Solar mass
Result
2,954 km
Schwarzschild radius: 2,954 km
Result in all units
Step-by-step solution
r = 2GM/c²
What Is the Schwarzschild Radius?
The Schwarzschild radius is the radius to which a mass must be compressed to become a black hole. It defines the size of the event horizon.
How is it calculated?
How to Calculate?
Rs = 2 × G × M ÷ c²
c = 3×10⁸ m/s.
- Enter the mass of the object.
For the Earth this radius is only a few millimetres.
Frequently Asked Questions
What is the event horizon?
It is the boundary of a black hole beyond which nothing that enters (including light) can return.