Hiroshima's “Little Boy” bomb is estimated at approximately 15 kilotons of TNT and Nagasaki's “Fat Man” bomb at 20 kilotons of TNT. One of the warheads in our arsenal, the B83 warhead? This weapon has a yield of 1,200 kilotons. That means that this weapon is 60 times more powerful than Fat Man.2 Ağu 2019