military personnel

China has the world's largest military by active personnel — approximately 2,035,000 active-duty service members as of 2024, according to IISS Military Balance estimates. India ranks second at roughly 1,476,000, the United States third at approximately 1,316,000. North Korea and Russia complete the top five. But personnel count is only one dimension of military capability: the United States spends more on defense than the next ten countries combined, and technology, doctrine, and logistics matter as much as headcount. This ranking covers the top 20 countries by active military personnel using IISS Military Balance 2024 and SIPRI data, with methodology, spending comparison, and caveats.

Which countries put the largest share of their population into uniform? A ranking of armed forces personnel per 1,000 residents, built from World Bank and IISS data, shows Eritrea and North Korea far ahead, then a mix of states facing neighbors they distrust, and explains why the figure says more about politics than about military strength.