Football stadiums (either soccer, American football, or others) have various capacities based on their size, seating, and construction. This can vary widely, from a few thousand, to tens of thousands, up to the largest stadiums which can seat more than 100,000 fans. Modern NFL stadiums seat an average of 70,000 to 80,000 spectators.
The largest three stadiums in the world as of 2011 were:
May Day Stadium (Pyongyang North Korea) - 150,000
Salt Lake Stadium (Kolkata, India) - 120,000
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It depends on the stadium. Some MLB stadiums can hold up to 50,000 people at a time, such as Giants or Yankees stadium. Some stadiums are very small, such as the Houston Astro's field, which can only hold just over 25,000 people.
I would say the average amount of people a Baseball field can hold is around 35,000 people.
The answer is: 2,191,317 total people could fit in to all of the NFL Stadiums that are currently in the United States.