Grand Slam
UK · 1945 · 6.6 t of TNT equivalent · conventional high-explosive
Overview
Largest conventional bomb used in World War II (about 6.6 t TNT equivalent).
With about 6.6 t of TNT equivalent[1], the Grand Slam is 2,273× smaller than the Hiroshima bomb. It is a conventional high-explosive weapon that releases its energy through chemical reactions, not nuclear processes. [2]
Effect radii not shown
The Grand Slam is a conventional (non-nuclear) weapon. The nuclear blast and thermal scaling laws this site uses do not apply to chemical explosives, so no effect radii are shown. See the methodology page.
Related Weapons
FAQ
What is the yield of the Grand Slam?
The Grand Slam is rated at about 6.6 t of TNT equivalent. That is 2,273× smaller than the Hiroshima bomb.
Is the Grand Slam bigger than the Hiroshima bomb?
The Hiroshima bomb (Little Boy) had a yield of approximately 15 kilotons. The Grand Slam at 6.6 t TNT is 2,273× smaller than the Hiroshima bomb.[3]
Sources
- 1.Source: Wikipedia, Grand Slam (bomb) — retrieved Oct 2026
- 2.Source: US DoD & ERDA (Glasstone & Dolan), via Atomic Archive, The Effects of Nuclear Weapons, 3rd ed. (1977), Chapter 1 — retrieved Oct 2026
- 3.Source: US DOE / NNSA Nevada Field Office, United States Nuclear Tests, July 1945 through September 1992 (DOE/NV-209 Rev. 16, Sep 2015), NNSS publication library — retrieved Oct 2026