Square miles to Square kilometers converter

To convert square miles to square kilometers, enter the value in the first field. The result in square kilometers is calculated automatically using the exact conversion factor.

1 mi² = 2.589988110336 km²
1 km² ≈ 0.386102158542 mi²

Formula: km² = mi² × 2.589988110336
mi² ≈ km² × 0.386102158542

Definitions: 1 mi² = 640 ac; 1 km² = 1000000 m²

The square mile (mi²) is 640 acres, about 2.59 square kilometers. It is used for the area of cities, counties, states and countries in the United States and the United Kingdom.

The square kilometer (km²) is one million square meters. It is used for the area of cities, lakes, countries and other large regions.

See the conversion table with commonly used values, handy for quick reference or study.