Calculate the Schwarzschild radius of a black hole, which defines the event horizon. This is the radius below which nothing, not even light, can escape the gravitational pull.
Enter your values below
Sun ≈ 2×10³⁰ kg, Sgr A* ≈ 4×10⁶ M☉
Default: 6.674×10⁻¹¹ N·m²/kg²
Default: 299,792,458 m/s
How this calculator works
Schwarzschild radius equals two times the gravitational constant times mass divided by the speed of light squared.
Common questions about this calculator
These calculators are for educational and informational purposes only. While we strive for accuracy, results should be verified for critical applications. Always consult authoritative sources for engineering or scientific work.
