The Federal Debt: Total Public Debt as Percent of Gross Domestic Product, a quarterly series, tracks the United States' public debt relative to its economic output.

This metric, identified by the FRED code GFDEGDQ188S, is derived from the U.S. Office of Management and Budget and the Federal Reserve Bank of St. Louis.

It is calculated by dividing the total public debt (GFDEBTN, expressed in billions of dollars) by the Gross Domestic Product (GDP) and multiplying by 100. The Federal Reserve Bank of St. Louis first constructed this series in October 2012.

This data is crucial for understanding the nation's fiscal health and economic stability. The series is presented as a percentage of GDP and is seasonally adjusted. For citation purposes, it is recommended to reference both the U.S. Office of Management and Budget and the Federal Reserve Bank of St. Louis.