Over the past year, countries around the world have risen and fallen in terms of military power. One of the most pivotal factors in this calculus is the overall size of a country’s military. While some countries might have technologically advanced forces, they might not have the manpower to back them up. Here, 24/7 Wall St. is taking a closer look at military powers with the largest armies and fit-for-service populations.
To determine the countries with the largest military forces, 24/7 Wall St. reviewed 2025 Military Strength Ranking from Global Firepower, an annually updated defense-related statistics website with information on 145 countries. Global Firepower ranked 145 countries based on their PowerIndex, a composite of over 60 measures in categories such as military might, financials, logistical capability, and geography. We ranked these countries according to their fit-for-service populations, but included numerous military personnel metrics for each country. The smaller the PowerIndex value the more powerful a nation’s theoretical conventional fighting capability is.
This is an updated version of a previously published article, now including more recent 2025 Military Strength Rankings along with various other military personnel statistics.
Population reaching military age annually: 4,794,908
Active military personnel: 654,000
Reserve military personnel: 550,000
Paramilitary personnel: 500,000
Total military personnel: 1,704,000
Military strength score and world rank: 0.2513 – #12 out of 145
Military defense budget: $7,640,000,000 – #38 out of 145
6. Brazil
Fit-for-service: 88,680,759
Population reaching military age annually: 3,520,824
Active military personnel: 360,000
Reserve military personnel: 340,000
Paramilitary personnel: 200,000
Total military personnel: 900,000
Military strength score and world rank: 0.2415 – #11 out of 145
Military defense budget: $26,157,300,000 – #19 out of 145
5. Nigeria
Fit-for-service: 90,437,404
Population reaching military age annually: 4,261,448
Active military personnel: 230,000
Reserve military personnel: 0
Paramilitary personnel: 50
Total military personnel: 280,000
Military strength score and world rank: 0.5771 – #31 out of 145
Military defense budget: $3,160,000,000 – #59 out of 145
4. Indonesia
Fit-for-service: 114,595,923
Population reaching military age annually: 4,786,562
Active military personnel: 400,000
Reserve military personnel: 400,000
Paramilitary personnel: 250,000
Total military personnel: 1,050,000
Military strength score and world rank: 0.2557 – #13 out of 145
Military defense budget: $10,600,000,000 – #29 out of 145
3. United States
Fit-for-service: 124,816,644
Population reaching military age annually: 4,445,524
Active military personnel: 1,328,000
Reserve military personnel: 799,500
Paramilitary personnel: 0
Total military personnel: 2,127,500
Military strength score and world rank: 0.0744 – #1 out of 145
Military defense budget: $895,000,000,000 – #1 out of 145
2. India
Fit-for-service: 522,786,598
Population reaching military age annually: 23,955,181
Active military personnel: 1,455,550
Reserve military personnel: 1,155,000
Paramilitary personnel: 2,527,000
Total military personnel: 5,137,550
Military strength score and world rank: 0.1184 – #4 out of 145
Military defense budget: $75,000,000,000 – #4 out of 145
1. China
Fit-for-service: 626,864,169
Population reaching military age annually: 19,810,606
Active military personnel: 2,035,000
Reserve military personnel: 510,000
Paramilitary personnel: 625,000
Total military personnel: 3,170,000
Military strength score and world rank: 0.0788 – #3 out of 145
Military defense budget: $266,850,000,000 – #2 out of 145
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