The United States of America is being the top country by GDP, constant US$ in the world. As of 2015, GDP, constant US$ in the United States of America was 16,597,445 million constant 2010 US$ that accounts for 22.48 % of the world's GDP, constant US$. The top 5 countries (others are China, Japan, Germany, and France) account for 51.43 % of it. The world's total GDP, constant US$ was estimated at 73,820,695 million constant 2010 US$ in 2015.
GDP at purchaser's prices is the sum of gross value added by all resident producers in the economy plus any product taxes and minus any subsidies not included in the value of the products. It is calculated without making deductions for depreciation of fabricated assets or for depletion and degradation of natural resources. Data are in constant 2005 U.S. dollars. Dollar figures for GDP are converted from domestic currencies using 2000 official exchange rates. For a few countries where the official exchange rate does not reflect the rate effectively applied to actual foreign exchange transactions, an alternative conversion factor is used.