Black Hole Event Horizon Calculator
Calculate Schwarzschild radius, event horizon, ergosphere, Hawking temperature, and black hole parameters.
Inputs
Solar Masses
Results
Schwarzschild Radius
2,954.127 m
Event Horizon Radius
2,954.127 m
Hawking Temperature
0.000000062 K
Hawking Lifetime
20,973,585,980,140,658,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 years
Ergosphere Radius2,954.127 m
How to Use This Calculator
- Enter the Black Hole Mass in solar masses — stellar black holes are 3–100 M☉, supermassive ones are millions to billions.
- Set the Spin Parameter (0–0.99): 0 is a non-rotating Schwarzschild black hole; values near 1 are maximally spinning Kerr black holes.
- Read the Schwarzschild Radius (m) and Event Horizon Radius (m) — for a spinning hole these differ due to frame-dragging.
- Note the Hawking Temperature (K) — stellar-mass black holes are effectively at absolute zero; only micro black holes radiate detectably.
- Use Hawking Lifetime (years) to understand evaporation timescale — a solar-mass black hole evaporates over ~10⁷⁴ years.
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Formula
r_s = 2GM/c² (Schwarzschild Radius)Related Calculators
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