The United States' gross domestic product and related figures are available from the U.S. Department of Commerce Bureau of Economic Analysis website's interactive data section, as of 2015. Other sources of this information include The World Bank and The World Factbook from the CIA.
As of 2015, the Bureau of Economic Analysis offers an estimate of the U.S. real GDP or the first quarter of 2015. The BEA defines the real GDP as "the value of the production of goods and services in the United States, adjusted for price changes." The BEA website also provides other tracked figures, including price index for gross domestic purchases, real personal consumption expenditures, real exports of goods and services, and real federal government consumption expenditures and gross investment.