How powerful was the Nagasaki atomic bomb compared with TNT?

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Atomic bombing of Hiroshima — atomic bombings of Hiroshima and Nagasaki A gigantic mushroom cloud rising above Hiroshima, Japan, on August 6, 1945, after a U.S. aircraft dropped an atomic bomb on the city, immediately killing more than 70,000 people.

The atomic bomb dropped on Nagasaki, known as Fat Man, exploded with an explosive force equivalent to 21,000 tons of TNT.123

This yield made it more powerful than Little Boy, the atomic bomb dropped on Hiroshima, which had an explosive force equivalent to 15,000 tons of TNT. The immense energy released by Fat Man resulted in the destruction of approximately 7.5 square kilometers of Nagasaki, causing catastrophic loss of life and long-term suffering from injuries and radiation poisoning.2413