The tech founder's wealth is estimated to be around $970 billion, mostly in stock, according to a Wall Street Journal analysis. This averages out to $992 a second over his 31-year career.
Musk's wealth includes $538 billion for his pre-IPO stake in SpaceX, $167 billion for his stake in Tesla, and another $150 billion or so for stock options in those companies he could exercise just about any time.
He has made about $3.6 million an hour over 31 years and his net worth eclipses the annual economic activity of more than 125 countries.
Musk's self-made fortune, built on electric vehicles, rocket ships and artificial-intelligence ambitions, amounts to about 3% of U.S. gross domestic product today.
