To answer the run-dmg skit, where in episode 9 of "When the Rules Lawyer wants to build a nuke" the DM calculates the D&D 5e damage for a Little Boy nuclear weapon to settle a question for a player.
Link to the episode in question: https://www.youtube.com/shorts/3axQJ834AdQ
It usually spits out about 347 million and change HP in damage.