<P> This article is a list of countries by military expenditure in a given year . Military expenditure figures are presented in United States dollars based on either constant or current exchange rates . These results can vary greatly from one year to another based on fluctuations in the exchange rates of each country's currency . Such fluctuations may change a country's ranking from one year to the next . </P> <P> The first list is based on the Stockholm International Peace Research Institute (SIPRI) 2017 Fact Sheet, which includes a list on the world's top 15 military spenders in 2016, based on current market exchange rates . The second list is based on the 2016 edition of "The Military Balance" published by the International Institute for Strategic Studies (IISS) using average market exchange rates . </P> <Table> <Tr> <Td> List by the Stockholm International Peace Research Institute 2018 Fact Sheet (for 2017) SIPRI Military Expenditure Database </Td> <Td> List by the International Institute for Strategic Studies Top 15 Defence Budgets 2017 </Td> </Tr> <Tr> <Td> <Table> <Tr> <Th> Rank </Th> <Th> Country </Th> <Th> Spending ($Bn .) </Th> <Th>% of GDP </Th> <Th>% of World share </Th> </Tr> <Tr> <Td> </Td> <Td> World total </Td> <Td> 1,739 </Td> <Td> 2.2 </Td> <Td> </Td> </Tr> <Tr> <Td> 01 </Td> <Td> United States </Td> <Td> 857.4 </Td> <Td> 7.8 </Td> <Td> 35.0 </Td> </Tr> <Tr> <Td> 02 </Td> <Td> People's Republic of China </Td> <Td> 228.0 </Td> <Td> 1.9 </Td> <Td> 13.0 </Td> </Tr> <Tr> <Td> 03 </Td> <Td> Russia </Td> <Td> 178.5 </Td> <Td> 15.7 </Td> <Td> 8.6 </Td> </Tr> <Tr> <Td> 04 </Td> <Td> Saudi Arabia </Td> <Td> 69.4 </Td> <Td> 5.3 </Td> <Td> 4.0 </Td> </Tr> <Tr> <Td> 05 </Td> <Td> India </Td> <Td> 63.9 </Td> <Td> 2.5 </Td> <Td> 3.7 </Td> </Tr> <Tr> <Td> 06 </Td> <Td> France </Td> <Td> 57.8 </Td> <Td> 2.3 </Td> <Td> 3.3 </Td> </Tr> <Tr> <Td> 07 </Td> <Td> United Kingdom </Td> <Td> 47.2 </Td> <Td> 1.8 </Td> <Td> 2.7 </Td> </Tr> <Tr> <Td> 08 </Td> <Td> Japan </Td> <Td> 45.4 </Td> <Td> 0.9 </Td> <Td> 2.6 </Td> </Tr> <Tr> <Td> 09 </Td> <Td> Germany </Td> <Td> 44.3 </Td> <Td> 1.2 </Td> <Td> 2.5 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> South Korea </Td> <Td> 39.2 </Td> <Td> 2.6 </Td> <Td> 2.3 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Brazil </Td> <Td> 29.3 </Td> <Td> 1.4 </Td> <Td> 1.7 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Italy </Td> <Td> 29.2 </Td> <Td> 1.7 </Td> <Td> 1.7 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Australia </Td> <Td> 27.5 </Td> <Td> 2.0 </Td> <Td> 1.6 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Canada </Td> <Td> 20.6 </Td> <Td> 1.3 </Td> <Td> 1.2 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Turkey </Td> <Td> 18.2 </Td> <Td> 2.2 </Td> <Td> 1.0 </Td> </Tr> </Table> </Td> <Td> <Table> <Tr> <Th> Rank </Th> <Th> Country </Th> <Th> Spending ($Bn .) </Th> </Tr> <Tr> <Td> 01 </Td> <Td> United States </Td> <Td> 773.5 </Td> </Tr> <Tr> <Td> 02 </Td> <Td> People's Republic of China </Td> <Td> 175.8 </Td> </Tr> <Tr> <Td> 03 </Td> <Td> Saudi Arabia </Td> <Td> 76.7 </Td> </Tr> <Tr> <Td> 04 </Td> <Td> Russia </Td> <Td> 61.2 </Td> </Tr> <Tr> <Td> 05 </Td> <Td> India </Td> <Td> 52.5 </Td> </Tr> <Tr> <Td> 06 </Td> <Td> United Kingdom </Td> <Td> 50.7 </Td> </Tr> <Tr> <Td> 07 </Td> <Td> France </Td> <Td> 48.6 </Td> </Tr> <Tr> <Td> 08 </Td> <Td> Japan </Td> <Td> 46.0 </Td> </Tr> <Tr> <Td> 09 </Td> <Td> Germany </Td> <Td> 41.7 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> South Korea </Td> <Td> 35.7 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Brazil </Td> <Td> 29.4 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Australia </Td> <Td> 25.0 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> Italy </Td> <Td> 22.9 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Israel </Td> <Td> 21.6 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Iraq </Td> <Td> 19.4 </Td> </Tr> </Table> <P> </P> </Td> </Tr> </Table> <Tr> <Td> List by the Stockholm International Peace Research Institute 2018 Fact Sheet (for 2017) SIPRI Military Expenditure Database </Td> <Td> List by the International Institute for Strategic Studies Top 15 Defence Budgets 2017 </Td> </Tr>

How much gdp does the us spend on military