Square kilometers to Square miles converter

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

1 km² ≈ 0.386102158542 mi²
1 mi² = 2.589988110336 km²

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

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

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

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.

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