Two months ago, when we calculated that the US would need a new "debt ceiling" of $19.6 trillion to last until after Obama's tenure, we may have been too optimistic: since the increase in the hard debt limit of $18.15 trillion which was raised at the end of October, the US appears to be growing its debt at a far faster pace than we had originally expected, and according to the latest public debt data, as of the last day of January, total US debt just hit 19,012,827,698,417.93.
This means that if the nominal US GDP as of December 31 which was $18.12 trillion grows at the 1.2% rate expected by the Atlanta Fed, total debt to GDP is now on pace to hit 105% at the next GDP tabulation, and rising fast from there.
It also means that since his inauguration in January 2009, the US debt has now risen by a whopping 78.9%, or $8.4 trillion. It was $10.6 trillion when Obama came into office.
Indicatively, the Congressional Budget Office forecasts that the national debt will hit $22.6 trillion by 2020 and will rise to $29.3 trillion by 2026.