How much HEU and plutonium exists in the world?
World stockpiles of separated plutonium and HEU, the essential ingredients of nuclear weapons, amount to well over 2,300 tons — enough to manufacture over 200,000 nuclear weapons. These materials exist in more than 40 countries, though Russia and the United States have by far the largest stockpiles. The global HEU stockpile is overwhelmingly military, but the 65 tons of the HEU stockpile that is in civilian use is enough for hundreds of nuclear bombs. The global stockpile of plutonium for military uses is in the range of 250 tons, and there are now more than 250 tons of separated plutonium in the civilian sector worldwide as well.
