What counts as the national debt?
The headline figure is Total Public Debt Outstanding from the U.S. Treasury. It has two parts: debt held by the public (about $32.1 trillion — Treasury bills, notes and bonds owned by investors, pension funds, the Federal Reserve and foreign governments) and intragovernmental holdings (about $7.7 trillion — mostly securities held by the Social Security and Medicare trust funds). It does not include state and local government debt or private debt like mortgages and credit cards.
Why the debt keeps growing
Whenever federal spending exceeds tax revenue, the Treasury borrows the gap by selling securities. The deficit is currently running above $2 trillion per year, and the debt grew about $2.9 trillion over the last twelve months. Annual interest on the debt — roughly $1.21 trillion — now exceeds the entire defense budget, the first sustained time that has happened since World War II.
How the live counter works
The Treasury publishes the official total once per business day. Our counter starts from the most recent official baseline and moves forward at the recent average pace — the same approach every "debt clock" uses. It is a visualization of the trend, not a second-by-second official measurement.