How high would a stack of 100 dollar bills be for a billion dollars?

A stack of 100 dollar bills totaling one billion dollars would be approximately 3,800 feet high. This calculation is based on the fact that a single 100 dollar bill is about 0.0043 inches thick. Therefore, stacking up 10 million 100 dollar bills (to reach a billion) results in a stack that is roughly equivalent to the height of a tall skyscraper.