The debt was $10.626 trillion on the day Mr. Obama took office. The latest calculation from Treasury shows the debt has now hit $14.639 trillion.
It's the most rapid increase in the debt under any U.S. president.
The national debt increased $4.9 trillion during the eight-year presidency of George W. Bush. The debt now is rising at a pace to surpass that amount during Mr. Obama's four-year term.