Tsar Bomba on Hong Kong
50 Mt thermonuclear weapon · China · Population 7,500,000 · Density 7,100/km²
About this scenario
This page calculates what would happen if the Tsar Bomba (USSR, 1961) detonated over Hong Kong (China). Largest nuclear weapon ever tested.
A special administrative region of China and one of the world's most densely populated territories. With an urban-core density of about 7,100 people per km², even a relatively small detonation over the city center would affect a large population.
The Tsar Bomba delivers 50 Mt of explosive yield — 3,333× more powerful than the Hiroshima bomb. The tables below show calculated effect radii for an air burst (optimized for blast spread) and a surface burst (which produces massive fallout).
Air-burst effects (Tsar Bomba over Hong Kong)
| Effect zone | Radius | Est. affected |
|---|---|---|
| Fireball (vaporization, 100% fatal) | 10.99 km | ~2,693,520 |
| Severe blast (20 PSI, ~98% fatal) | 17.13 km | ~3,719,293 |
| Moderate blast (5 PSI, ~50% fatal) | 36.60 km | ~11,668,923 |
| Light blast (1 PSI, glass injuries) | 104.12 km | ~10,596,128 |
| 3rd-degree thermal burns | 56.58 km | — |
| 2nd-degree thermal burns | 101.33 km | — |
Estimated total fatalities: ~18,081,736 · Estimated total affected (inside 1 PSI light-blast radius): ~241,804,103.
Surface-burst effects (with fallout)
A surface burst trades blast spread for radioactive fallout — much smaller blast radii but a large lethal fallout plume drifting downwind. This is what would happen if the Tsar Bomba struck ground level rather than detonating optimally above Hong Kong.
| Effect zone | Radius (surface burst) |
|---|---|
| Fireball | 8.79 km |
| Severe blast (20 PSI) | 9.42 km |
| Moderate blast (5 PSI) | 20.13 km |
| Light blast (1 PSI) | 57.27 km |
| 3rd-degree thermal burns | 33.95 km |
| Lethal fallout zone | ~909.4 km |
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See the actual blast zones overlaid on a map of Hong Kong with population-density-based casualty estimates updated in real time as you move the detonation point.
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FAQ
What would happen if the Tsar Bomba detonated over Hong Kong?
In an air burst over Hong Kong, the Tsar Bomba (50 Mt) would produce a fireball about 10.99 km in radius. The 5 PSI moderate-blast zone — where most residential buildings collapse — would extend to 36.60 km. Light blast damage and shattered windows would reach 104.12 km. Given Hong Kong's urban density (~7,100/km²), this scenario yields an estimated 18,081,736 immediate fatalities and about 10,596,128 additional injured.
How many people would die in Hong Kong from a Tsar Bomba strike?
An air burst of the Tsar Bomba over Hong Kong could cause an estimated 18,081,736 immediate fatalities and 10,596,128 additional injuries. The fireball alone (radius 10.99 km) would kill approximately 2,693,520 people; the severe-blast zone (20 PSI, radius 17.13 km) would add 3,719,293; the moderate-blast zone (5 PSI, radius 36.60 km) would add 11,668,923 more. Real numbers depend heavily on time of day, sheltering, weather, and altitude of detonation.
What is the blast radius of the Tsar Bomba on Hong Kong?
For an air burst over Hong Kong: fireball 10.99 km, severe blast (20 PSI) 17.13 km, moderate blast (5 PSI) 36.60 km, light blast (1 PSI) 104.12 km. Thermal radiation causes 3rd-degree burns out to 56.58 km. A surface burst would shrink the blast radii by roughly 40 percent but generate massive radioactive fallout extending ~909 km from ground zero.
Is the Tsar Bomba bigger than the bomb that hit Hiroshima?
The Hiroshima bomb (Little Boy) had a yield of about 15 kilotons. The Tsar Bomba at 50 Mt is 3,333× more powerful than the Hiroshima bomb.