Black Hole Calculators
Quick, accurate calculators for the questions people ask most about black holes. Everything runs in your browser, and each tool explains the physics behind its numbers.
Schwarzschild Radius Calculator
Turn any mass into a black hole: event horizon size, photon sphere, shadow size, density, tidal forces and Hawking temperature, with presets from Earth to M87*.
Black Hole Time Dilation Calculator
How much slower does time run near a black hole? Hover near a horizon or orbit a spinning black hole, including Interstellar’s Miller’s planet (1 hour = 7 years).
Simulators
- Black hole image simulator: see how a black hole bends the light of any picture
- Black hole embedding diagram: curved space drawn as a surface
- Wormhole embedding diagram: shape your own Interstellar-style wormhole