A simple graphic showing comparative nuclear fireball radii for a number of different tests and warheads. From largest to smallest, the diameter are:
Tsar Bomba — 50 Mt — 4.6 km (2.9 mi)
Castle Bravo — 15 Mt — 2.84 km (1.76 mi)
W59 warhead (Minuteman missile) — 1 Mt — .96 km (0.60 mi)
W88 warhead (Peacekeeper missile) — 350 kt — .64 km (0.4 mi)
Fat Man bomb (dropped on Nagasaki, Japan) — 18 kt — .2 km (0.1 mi)
Note that these are only for the fireball component of the explosion — radiation, blast, and heat would extend far beyond these distances (i.e. for the Tsar Bomba, anyplace with 6.56 km would receive 500 rems of radiation, there would be near total fatalities for the air blast within 9.95 km, structural damage at 26.26 km, and third-degree burns at 58 km). This is meant only to give some means of comprehending the differences in scale between different weapon designs.
This W3C-unspecified vector image was created with Inkscape .
FastfissionTranslation: Tachymètre (talk)