Schwarzschild Radius Calculator

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Forward mode: enter mass, get radius. Reverse mode: enter radius, get mass.
1 solar mass = 1.989 × 10³⁰ kg. 1 Earth mass = 5.972 × 10²⁴ kg.
Mass of the object you want to analyse.
M☉
Load a preset mass for a well-known astronomical object.
Schwarzschild radius
2.954 km

Event horizon radius below which escape velocity exceeds light speed

Schwarzschild radius (m)2,954.1266m
Mass1.000 M☉ (1.989e+30 kg)
Gravitational field at event horizon1.521e+13 m/s²m/s²
Average density to become a black hole1.842e+19 kg/m³
Schwarzschild radius (m)2,954.1266

Event horizon radius: 2.954 km

  • The Schwarzschild radius is 2.954 km. Any object of this mass compressed within that radius would form a black hole.
  • This size is within the range of stellar-mass and intermediate-mass black holes confirmed by gravitational-wave detections.

Next stepCompare this to the object's actual radius in the reference table below to see how far it is from being a black hole.

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