Schwarzschild Radius Calculator

Find a black hole's event horizon radius.

Schwarzschild radius 2,953.99

Radius 0.003

Formula: r = 2GM ÷ c²

Step-by-step with your numbers:

1. Values used:

2. Mass = 1.989e+30

4. Schwarzschild radius = 2,953.99

5. Radius = 0.003

Did we solve your problem today?

The Schwarzschild radius is the size an object must shrink to become a black hole.

The math behind it

r = 2GM ÷ c². For the Sun it's just ~3 km.

Sun's mass → ~2.95 km.

Earth as a black hole?

Its Schwarzschild radius is under 9 mm.