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Thursday, June 18, 2026

how much does it cost to build an atomic bomb (U-235) from scratch?

The minimum critical mass is 15 kg. 


Using the above as a shortcut, 1 g of 93% enriched uranium costs $6,690. 

(15,000 g)*$6,690 = $100,350,000

The other costs of building the bomb are negligible in comparison. From this I can conclude that any country that can scrape together a few hundred million dollars can make a nuclear weapon.

There are about 87 countries which spend at least $1 billion per year on their military. Thus, many countries could afford nuclear weapons but choose not to build them. This estimate checks out because Pakistan's annual military is about $7.6 billion and they are a nuclear power. North Korea is also a nuclear power, and they spend about $4,7 billion per year on their military. 





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