Named weapon

W76-1 blast radius (90 kt)

Last updated September 13, 2026

W76-1 is the 90 kt ‘workhorse’ Trident yield on this globe. It is a step between Hiroshima-scale and the larger W88.

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.

Yield 90 kt · 986 m (3,235 ft) optimum airburst · workhorse Trident warhead

Ground ranges for W76-1 (90 kt, 986 m (3,235 ft) optimum airburst) in this simulator.
Effect	Ground range	What the model means
Fireball	544 m (1,786 ft)	Maximum luminous radius
20 psi	1.5 km (4,999 ft)	Heavy destruction
5 psi	3.3 km (2.1 mi)	Most buildings collapse
Thermal	4.2 km (2.6 mi)	3rd-degree burns
1 psi	7.6 km (4.7 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.

Cube-root scaling means 90 kt is not six times Little Boy’s radius. It is a bit under two times for blast, which still moves the 1 psi ring from neighbourhoods to a large slice of a compact capital.

This is a named US stockpile class from open literature, not a targeting manual. The simulator ignores missile range, accuracy, and defenses.

City pages stay on 15 kt by default so this yield remains a deliberate upgrade you choose.

See this yield on a place

New York · London · Seoul · Los Angeles

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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