Most Powerful Nations in the World - IMF Report | Felix Omoko Blog

IMF
Gross domestic product 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.

1 United States        18,624,450

2 China        11,232,108
3 Japan        4,936,543
4 Germany        3,479,232
5 United Kingdom    2,629,188
6 France                2,466,472
7 India        2,263,792
8 Italy       1,850,735
9 Brazil               1,798,622
10 Canada               1,529,760
11 South Korea       1,411,042
12 Russia       1,283,162

Source: UN, IMF.