| Land area at its peak | Empire | % Correct |
|---|---|---|
| 13.7 million sq miles (35.5 million km) | British Empire | 96%
|
| 9 million sq miles (23 million km) | Mongol Empire | 92%
|
| 7 million sq miles (18 million km) | Spanish Empire | 81%
|
| 8.8 million sq miles (22.8 million km) | Russian Empire | 80%
|
| 1.9 million sq miles (5 million km) | Roman Empire | 79%
|
| 2 million sq miles (5.2 million km) | Ottoman Empire | 68%
|
| 5 million sq miles (13 million km) | Qing Dynasty | 59%
|
| 2.1 million sq miles (5.5 million km) | Persian Empire | 48%
|
| 1.08 million sq miles (2.8 million km) | Byzantine Empire | 37%
|
| 1.54 million sq miles (4 million km) | Mughal EMpire | 37%
|
| 4.3 million sq miles (11.1 million km) | Umayyad Caliphate | 28%
|
| 4.29 million sq miles (11 million km) | Abbasid Caliphate | 19%
|
| 1.7 million sq miles (4.4 million km) | Mexican Empire | 17%
|
| 1.15 million sq miles (3 million km) | Danish Empire | 4%
|
| 1.78 million sq miles (4.6 million km) | Tibetan Empire | 4%
|