What is the blast radius of a nuclear weapon?

Answer 1

That depends on what you're referring to: The fireball radius (the nuclear explosion itself), the total anhiliation range radius, and etc.

For example, the bomb launched on Hiroshima had a fireball of several hundred feet in radius, a 1km total destruction range radius, and severe damage for miles.

For firepower bombs (nuclear bombs made for power show & not effectiveness)

The Tsar bomba of USSR had 50~55 megatons of TNT firepower, a fireball with 1km+ radius, total destruction for miles, and created a sound shockwave that could be heard in Norway/Other far Northern European areas.

Modern nuclear weapons don't have a single blast radius; the U.S. developed M.I.R.V.s (cluster nuclear bombs) that spread apart to create a shotgun blast of multiple nuclear explosions.

Answer 2

The blast radius of a nuclear weapon can vary significantly depending on its yield. For example, a small tactical nuclear weapon may have a blast radius of a few hundred meters, while a larger strategic nuclear weapon could have a blast radius of several kilometers. The effects of a nuclear blast extend beyond the blast radius, with fallout and thermal radiation causing additional damage.