Adjusted for inflation, the Manhattan project cost nearly US$ 2 billion in 1940s money, or about $26 billion in 2016 dollars says https://en.wikipedia.org/wiki/

Adjusted for inflation, the Manhattan project cost nearly US$ 2 billion in 1940s money, or about $26 billion in 2016 dollars says https://en.wikipedia.org/wiki/Manhattan_Project https://en.wikipedia.org/wiki/Manhattan_Project .