Schwarzschild Radius Calculator
Free calculate event horizon radius of black holes. determine r_s = 2gm/c² for black holes and compact objects.
Input Parameters
Results
Enter mass to calculate Schwarzschild radius
Schwarzschild Radius Formula
Formula
r_s = 2GM / c²
Where:
- • r_s = Schwarzschild radius (m)
- • G = gravitational constant = 6.674×10⁻¹¹ m³/(kg·s²)
- • M = mass (kg)
- • c = speed of light = 2.998×10⁸ m/s
Examples
- • Sun: ~3 km
- • Earth: ~9 mm
- • 10 solar masses: ~30 km
- • Supermassive BH: millions of km