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Paris nuclear blast radius

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Paris inside the Périphérique is compact. A 15 kt airburst over the Louvre core fills a visible share of the historic city while the wider Île-de-France still sits outside the rings.

Open Paris 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.

Aim point: Louvre / Right Bank core · Weapon: Little Boy (15 kt, 543 m (1,780 ft) optimum airburst)

Ground ranges for Little Boy (15 kt, 543 m (1,780 ft) optimum airburst) in this simulator.
Effect Ground range What the model means
Fireball 266 m (872 ft) Maximum luminous radius
20 psi 839 m (2,751 ft) Heavy destruction
5 psi 1.8 km (1.1 mi) Most buildings collapse
Thermal 2.0 km (1.3 mi) 3rd-degree burns
1 psi 4.2 km (2.6 mi) Windows shatter
Rings scaled to 1 psi. Yellow fireball, red 20 psi, orange 5 psi, gold thermal, blue 1 psi. Not a map of buildings.

Casualty estimate at this pin

People on the WorldPop 2020 grid inside this scenario’s 1 psi ring. Rounded educational estimate, not a forecast.
Estimated deaths 126,080
Estimated injuries 408,298
Residents inside 1 psi 1,479,547

What the rings cover

Inner rings sit on the Louvre, the river, and neighbouring central arrondissements. 5 psi covers a large share of historic Paris. 1 psi reaches toward inner suburbs and still does not map the whole Île-de-France.

The preset aims at the Right Bank museum and palace district, a tourist shorthand that is also a dense mixed-use grid. WorldPop counts residents, so daytime visitor load is not in the estimate.

Because the arrondissements are small, the 1 psi ring looks more ‘city-wide’ here than in Los Angeles or London. That is geography, not a different bomb.

Tsar Bomba over Paris is a common curiosity search. Use the Tsar Bomba weapon page and open Paris from there if you want that scale. This page stays on Little Boy so the city series stays comparable.

Related pages

London · New York · Istanbul · Tsar Bomba

All cities and sites

City index · Historic sites · Weapon yields

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