Schwarzschild Radius Calculator
The Schwarzschild radius marks the event horizon of a non rotating black hole, the boundary from inside which not even light can escape. It is given by two times the gravitational constant times the mass, divided by the speed of light squared. Remarkably, any mass compressed below this radius becomes a black hole, so you can compute the horizon for anything from the Sun to the Earth to yourself. This calculator accepts a mass in kilograms or in solar masses and returns the radius in meters and kilometers, plus the diameter for scale. The Sun would need to shrink to about three kilometers across to become one. Everything is computed locally in your browser.
How to use Schwarzschild Radius Calculator
- Enter the object mass in kilograms or solar masses.
- Read the Schwarzschild radius in meters and kilometers.
- Compare it to the object real size to see how far from collapse it is.
Frequently asked questions
What is the Schwarzschild radius?
It is the event horizon size of a non-rotating black hole, the distance from the center inside which not even light escapes, found from two times G times mass over c squared.
How does the horizon scale with mass?
The radius grows in direct proportion to mass, so doubling the mass doubles the horizon; the Sun compressed to a black hole would span only about 3 kilometers.
Can any object have a Schwarzschild radius?
Every mass has one mathematically, but it only becomes a real horizon if the mass is compressed inside that radius, which does not happen for ordinary bodies.
What is Schwarzschild Radius Calculator?
The Schwarzschild radius marks the event horizon of a non rotating black hole, the boundary from inside which not even light can escape. It is given by two times the gravitational constant times the mass, divided by the speed of light squared.
Is Schwarzschild Radius Calculator free to use?
Yes. Schwarzschild Radius Calculator is completely free, with no sign-up and no usage limits.
Does Schwarzschild Radius Calculator work in a web browser?
Yes. Schwarzschild Radius Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Schwarzschild Radius Calculator?
Yes. Schwarzschild Radius Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/schwarzschild-radius-calculator)