Schwarzschild Radius Calculator
Find how small a mass must be squeezed to become a black hole.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
This calculator computes the Schwarzschild radius: Rs = 2GM/c², the radius to which any mass must be compressed for its escape velocity to reach the speed of light, forming an event horizon beyond which nothing — not even light — can escape.
Astrophysics students and enthusiasts use it to see how extreme the compression required for black hole formation really is — squeezing Earth's mass into about 9 millimeters, or the Sun's into about 3 kilometers. Enter a mass to get its Schwarzschild radius.
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