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One
Actually there have only been 44 presidents including Barack Obama.
GEORGE WASHING TO AND ALL THE MOST OF THE PRESIDENTS THERE ARE 10 PRESIDENTS THAT SERVED TWO TERMS
The 22nd Amendment of the US Constitution limits presidents to serving a maximum of two four-year terms.
The 22nd Amendment restricts presidents of the USA to be elected no more than two times.
Only one and that was Franklin Roosevelt.
Some Presidents served more than one term.
The reason that there have been four more U. S. Vice Presidents than there have been U. S. Presidents is due to the eleven Presidents who did not have just one Vice President. Four Presidents, Tyler, Fillmore, A. Johnson and Arthur, had no Vice President (a 4-VP shortage). Six Presidents, Madison, Lincoln, Grant, Cleveland, McKinley and Nixon, each had two Vice Presidents (a 6-VP surplus). One President, Franklin Roosevelt, had three Vice Presidents (a 2-VP surplus). Six extra plus two extra minus four short equals four extra.
Only one--Franklin Delano Roosevelt was elected to four terms, though he died before he could complete his fourth. In response, the US Constitution was amended to prohibit future Presidents from being elected to more than two terms.
The two term limit on Presidents wasn't passed until February 27, 1951.
Cause, including Obama a few more presidents were elected more than once so they had two presidential inaugurations.