List of countries by GDP (nominal)
Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates. Nominal GDP does not take into account differences in the cost of living in different countries, and the results can vary greatly from one year to another based on fluctuations in the exchange rates of the country's currency. Such fluctuations may change a country's ranking from one year to the next, even though they often make little or no difference in the standard of living of its population.
List of countries by GDP (PPP)
This article includes a list of countries by their forecasted estimated gross domestic product based on purchasing power parity, abbreviated GDP (PPP). Countries are sorted by GDP PPP forecast estimates from financial and statistical institutions in the limited period January–April 2017, which are calculated at market or government official exchange rates. The data given on this page are based on the international dollar, a standardized unit used by economists. Certain regions that are not widely considered countries such as the European Union and Hong Kong also show up in the list if they are distinct jurisdiction areas or economic entities.