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🔬 Science

Black Hole Event Horizon Calculator

Calculate the Schwarzschild radius (event horizon) of a black hole based on its mass.

⚡ Instant 🆓 Free 🔒 Private
black hole astronomy physics relativity schwarzschild

Schwarzschild Radius: The Event Horizon

The Schwarzschild radius is the radius of the event horizon of a Schwarzschild black hole. If an object's mass is compressed into a sphere with a radius smaller than this, nothing—not even light—can escape its gravity.

  • Rs: Schwarzschild Radius.
  • G: Gravitational Constant.
  • M: Mass of the object.
  • c: Speed of light (~3.00 × 10⁸ m/s).

Formula: Rs = 2GM / c²

If our Sun were to become a black hole, its event horizon would only be about 3 kilometers wide!