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Named weapon
Castle Bravo blast radius (15 Mt)
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Castle Bravo was the largest US nuclear test, 15 Mt on 1 March 1954 at Bikini — a thousand times the Little Boy yield. The preset is a surface burst.
Open Castle Bravo in the 3D simulator
Educational estimate only. Blast and heat rings use simplified yield scaling. They ignore terrain, weather, shielding, and weapon design. Casualty counts use WorldPop 2020 residents on an approximately 1 km grid and ignore time of day, commuting, shelter, and evacuation. This is not a targeting or civil-defense tool. About the model.
| Effect | Ground range | What the model means |
|---|---|---|
| Fireball | 3.7 km (2.3 mi) | Maximum luminous radius |
| 20 psi | 6.2 km (3.8 mi) | Heavy destruction |
| 5 psi | 13.8 km (8.6 mi) | Most buildings collapse |
| Thermal | 35.4 km (22.0 mi) | 3rd-degree burns |
| 1 psi | 32.6 km (20.2 mi) | Windows shatter |
The test ran hotter than expected. Fallout on nearby atolls and a Japanese fishing boat is the history this graphic cannot replay. The local fallout overlay is a uniform wind sketch.
On a city pin, 15 Mt is a regional disk in this model. On Bikini, it is an ocean-scale lesson in why atolls were chosen.
Tsar Bomba is roughly three times this yield and an airburst at 4 km. B41 sits between them in the US retired-bomb list.
See this yield on a place
Bikini Atoll · Enewetak Atoll · Novaya Zemlya · New York
Other weapons
Little Boy · Fat Man · W76-2 · W76-1 · W87 · W88 · B83 · B53 · Ivy Mike · Castle Bravo · B41 · Tsar Bomba
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