Around 1900, Britain ruled about a quarter of the world’s land and had one of the strongest militaries anywhere. Maintaining such a vast empire required a huge army, and only Russia, France, Germany, and China had more soldiers at the time.
The map below, created by Reddit user vladgrinch using data from the International Institute for Strategic Studies, shows countries with larger active military personnel than the UK: 1900 vs. 2026.
The UK’s regular forces now number around 137,000 trained personnel, according to UK Ministry of Defence figures from October 2025. That places Britain below Vietnam (482,000), Egypt (438,500), and Myanmar (406,000) in raw troop numbers, among many others. Since 1945, the size of Britain’s regular armed forces has been in almost constant decline, as the empire that once needed all those soldiers wound down and defence budgets were cut repeatedly.
Country
~1900 Active Personnel (est.)
Russia (Imperial)
~860,000
France (Third Republic)
~620,000
Germany (Empire)
~545,000
China (Qing dynasty)
~450,000+
United Kingdom
~430,000
Country
2026 Active Personnel
China (PLA)
2,035,000
India
1,475,750
United States
1,315,600
North Korea
1,280,000
Russia
1,134,000
United Kingdom
~137,000
But troop numbers alone don’t capture what a military can actually do. Britain still ranks sixth in the world for defence spending according to SIPRI, ahead of France, Japan, and Saudi Arabia. A nuclear deterrent, two aircraft carriers, and a force designed for international deployment give the UK reach that most countries on that red map simply don’t have.
