⚫Schwarzschild Radius Calculator
Calculate the event horizon (Schwarzschild radius) of a black hole for any mass. Visualize what happens when the Sun or Earth collapses.
Black hole calculator — calculate Schwarzschild radius (event horizon) for any mass. Kala chhedra ka aakar. Sun, Earth, or stellar objects. Free.
How to Use Schwarzschild Radius Calculator — Step by Step
- 1Enter the mass of the object
- 2Select the unit — solar masses, Earth masses, or kg
- 3Click 'Calculate Schwarzschild Radius'
- 4View the event horizon size in meters or km
- 5Compare with known black holes in the reference table
Why Use ToolNest for Schwarzschild Radius Calculator?
- ⚫Formula: r_s = 2GM/c² — exact general relativistic result
- 🌟Input in solar masses, Earth masses, or kg
- 📊Reference table: Sun, Earth, stellar BH, and Sagittarius A*
- 💡Shows average density inside the event horizon
- 🆓Perfect for physics students and curious space enthusiasts
Related Tools
Popular on ToolNest
Frequently Asked Questions
What is the Schwarzschild radius?
The Schwarzschild radius is the radius at which a mass must be compressed for it to become a black hole (event horizon). For any mass M, r_s = 2GM/c². For the Sun, this is about 3 km.
What is the Schwarzschild radius of Earth?
Earth's Schwarzschild radius is about 8.87 mm — roughly the size of a marble. If Earth were compressed to that size, it would become a black hole.
Can the Sun become a black hole?
Not naturally — the Sun is too low-mass. When it dies in about 5 billion years, it will expand into a red giant and then collapse to a white dwarf. Only stars above about 20 solar masses form black holes.
Is the Schwarzschild radius the same as event horizon?
For a non-rotating black hole, yes. The Schwarzschild radius defines the event horizon — the boundary of no return. Rotating black holes (Kerr metric) have a more complex structure with an ergosphere.