Question: how powerful are modern nukes?
Answer: As the above video from YouTube channel RealLifeLore illustrates, the blast from the Little Boy released about 15 kilotons of energy, equivalent to 15,000 tons of TNT, and sent a mushroom cloud up to about 25,000 feet. ... 1.2 megatons, equaling 1,200,000 tons of TNT, making it 80 times more powerful than the Little Boy.