Asteroid Impact Calculator

Energy and damage of an asteroid hitting Earth.

Diameter (m)

Velocity (km/s)

Density (kg/m³)

Impact surface

Energy released

75.1 Mt

TNT equivalent

≈ Tsar Bomba (largest H-bomb)

Impactor mass: 1570.80 million kg

Energy: 3.14e+17 J

Crater diameter (land): 1.03 km

Fireball radius: 2.8 km

Heavy airblast damage out to: 16.9 km

Seismic magnitude: M5.9

Rough scaling laws from Collins, Melosh, & Marcus (2005). The Chicxulub impactor (10 km diameter) released the energy of about 100 million Hiroshimas. Statistically you can sleep tonight - 50 m+ impactors hit roughly once per millennium.

About

Pick diameter, density, velocity, and surface. The tool computes kinetic energy, TNT-equivalent yield, crater size, fireball radius, and the seismic magnitude. Compares to known impact events.

How to use

Enter asteroid size and speed.
Pick composition.

FAQ

Should I worry?+

Statistically you can sleep tonight. 50 m+ impactors hit roughly once per millennium. The dinosaur-killer was about 10 km - those hit roughly once per 100 million years.