Real GDP is a quarterly figure, but estimates are released late-month over three successive months, immediately following the relevant quarter. Real GDP is a summary measure of economic performance, as it represents the total amount of goods and services produced in the U.S. The advance estimate is released initially followed by two revisions—the preliminary and the final. There are four broad components to real GDP, consumption (68%), investment (18%), government spending (18%) and net exports (4%, due to trade deficit).
Real GDP is calculated using a chain-weighted price system, which produces a more accurate comparison of economic growth over long periods. One can also separate increases in volume from increases in prices.