How Do Countries Create Nuclear Weapons?

Walk through the basics of nuclear reactions.

25 kilograms

(about 55 pounds) of highly enriched uranium or 8 kilograms (about 18 pounds) of plutonium is needed to make an elementary nuclear weapon.

Source: Belfer Center and IAEA


The Nuclear World

Look at the nuclear status quo to see where nuclear stockpiles exist.

31 countries and areas operate a total of 449 nuclear reactors for generating power. Top countries:

  • United States: 99
  • France: 58
  • Japan: 42

Source: IAEA

How Nuclear Proliferation Affects You

Explore how nuclear weapons and materials shape today’s world.

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