Square miles (mi²) to Square kilometers (km²) Conversion
Square miles
The square mile is a unit of area equal to exactly 2,589,988.110336 square metres (approximately 2.59 km²). It is the standard unit for measuring large land areas, population density, and political jurisdictions in the United States and United Kingdom. One square mile contains exactly 640 acres — the basis of the US Public Land Survey System that structured much of North American land division.
Square kilometers
The square kilometre is a unit of area equal to one million square metres (10⁶ m²) and is the standard unit for expressing the surface areas of countries, cities, lakes, forests, and other large geographic features. Russia, the world's largest country, covers approximately 17.1 million km². The surface area of Earth is approximately 510.1 million km², of which about 70.8% is ocean.
| Square miles (mi²) | Square kilometers (km²) |
|---|---|
| 0.1 mi² | 0.259 km² |
| 1 mi² | 2.59 km² |
| 2 mi² | 5.18 km² |
| 3 mi² | 7.77 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 20 mi² | 51.7998 km² |
| 30 mi² | 77.6996 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
| 1000 mi² | 2,589.9881 km² |
Frequently Asked Questions (FAQ)
How many square kilometers are in 1 square miles?
1 square miles (mi²) is exactly 2.59 square kilometers (km²).
How do I convert square miles to square kilometers?
Multiply the value in square miles by 2.59 to get the result in square kilometers. Or use the converter above — type any number and see the result instantly.