Black Hole Survival Distance Calculator

Estimate how close you could get to a black hole before extreme gravity, tidal forces, and radiation become fatal.

Mass in solar masses. Supermassive black holes can be millions or billions.
Distance from the event horizon, in thousand kilometers.
Higher speed generally increases exposure risk.
Represents radiation and structural protection.
Supermassive black holes can be less instantly destructive near the horizon.
Hot plasma and radiation around the black hole.
How we calculate

This simplified model estimates risk from black hole mass, distance from the event horizon, approach speed, protection, type, and accretion disk activity.

  • Schwarzschild radius estimate: mass × 3 km
  • Gravity risk: increases when distance gets smaller
  • Radiation risk: increases with weaker protection and active accretion disks
  • Final score: capped from 0 to 100