Calculate the Schwarzschild radius and other properties of a black hole based on its mass.
Mass Parameters
Event Horizon Properties
Enter parameters to calculate
Quick Reference
GGravitational constant (6.674e-11)
MMass of the object
cSpeed of light (2.998e8 m/s)
ρM / (4/3 π Rs³)
Overview
The Schwarzschild radius is the radius of the event horizon of a non-rotating black hole. Any object compressed smaller than this radius will become a black hole.
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Pro Tips
The Schwarzschild radius is directly proportional to the mass.
The 'surface gravity' is the gravitational acceleration at the event horizon.
Surprisingly, supermassive black holes have much lower average densities than stellar-mass ones.
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Fun Facts
"If the Earth were compressed into a black hole, its Schwarzschild radius would be about 9 millimeters."
"The Sun would have a Schwarzschild radius of about 3 kilometers."
"Once you pass the event horizon, all paths in spacetime lead towards the singularity."
