| Rank | Years | Leader | Amount | Place | % Correct |
|---|---|---|---|---|---|
| 3 | 1934-1945 | Adolf Hitler | 13,518,250-25,495,692 | Nazi Germany | 99%
|
| 5 | 1922-1953 | Joseph Stalin | 3,300,000-15,000,000 | Soviet Union | 97%
|
| 2 | 1946-1976 | Mao Zedong | 13,597,000-70,000,000 | China | 94%
|
| 1 | 1206-1405 | Genghis Khan, Kublai Khan, Timur | 20,000,000-40,000,000 | Mongol Empire, Timurid Empire | 90%
|
| 6 | 1895-1945 | Emperor Hirohito | 3,000,000-14,000,000 | Japan, east and southeast Asia, Oceania | 76%
|
| 18 | 1922-1945 | Benito Mussolini | 158,000-628,000 | Italy, Libya, Ethiopia, Yugoslavia, Greece | 70%
|
| 12 | 1948- | Kim Il-sung, Kim Jong-il, Kim Jong-un | 710,000-3,500,000 | North Korea | 65%
|
| 11 | 1975-1979 | Pol Pot | 1,063,000-2,530,000 | Cambodia | 63%
|
| 7 | 1885-1908 | King Leopold II | 3,000,000-13,000,000 | Congo Free State | 59%
|
| 16 | 1979-2003 | Saddam Hussein | 200,000-2,000,000 | Iraq | 56%
|
| 19 | 1954-2000 | Ho Chi Minh, Viet Cong | 145,225-1,082,000 | Vietnam | 55%
|
| 20 | 1971-1979 | Idi Amin | 100,000-500,000 | Uganda | 49%
|
| 4 | 1928-1946 | Chiang Kai-Shek | 5,965,000-18,522,000 | Republic of China | 46%
|
| 17 | 1939-1975 | Francisco Franco | 195,000-265,000 | Spain, Austria, Russia | 44%
|
| 21 | 2011- | Bashar al-Assad | 100,000 | Syria | 42%
|
| 14 | 1965-1998 | Suharto | 240,500-3,418,000 | Indonesia | 37%
|
| 10 | 1989-2019 | Omar al-Bashir | 1,386,734-3,400,000 | Sudan | 21%
|
| 9 | 1913-1922 | Young Turks | 1,489,000-2,810,000 | Ottoman Empire | 15%
|
| 13 | 1941-1945 | Ante Pavelić, Nikola Mandić | 300,000-1,088,000 | Croatia | 6%
|
| 15 | 1977-1987 | Mengistu Haile Mariam | 225,000-2,000,000 | Ethiopia | 6%
|
| 8 | 1829-1842 | Queen Ranavalona I | 2,500,000 | Madagascar | 6%
|