The federal public debt, which was $6.3 trillion ($56,000 per household) when Mr. Obama entered office amid an economic crisis, totals $8.2 trillion ($72,000 per household) today, and it's headed toward $20.3 trillion (more than $170,000 per household) in 2020, according to CBO's deficit estimates.
That figure would equal 90 percent of the estimated gross domestic product in 2020, up from 40 percent at the end of fiscal 2008. By comparison, America's debt-to-GDP ratio peaked at 109 percent at the end of World War II, while the ratio for economically troubled Greece hit 115 percent last year.
"That level of debt is extremely problematic, particularly given the upward debt path beyond the 10-year budget window," said Maya MacGuineas, president of the bipartisan Committee for a Responsible Federal Budget.
For countries with debt-to-GDP ratios "above 90 percent, median growth rates fall by 1 percent, and average growth falls considerably more," according to a recent research paper by economists Kenneth S. Rogoff of Harvard and Carmen M. Reinhart of the University of Maryland.