This converter switches between square kilometers (km²) and square miles (mi²) in both directions — useful for comparing land areas, city sizes, and map measurements across metric and imperial systems. Type into either field and the other updates live.
How it works
The conversion uses one exact factor: 1 square mile = 2.589988110336 km².
- km² to mi²: square miles = km² ÷ 2.589988
- mi² to km²: square kilometers = mi² × 2.589988
That factor is the square of the linear mile-to-kilometer ratio. One mile is exactly 1.609344 km, and since area scales with length squared, 1.609344² = 2.589988110336.
Example
Convert a 500 km² national park:
500 ÷ 2.589988 ≈ 193.05 mi²
Going the other way, 50 mi² is 50 × 2.589988 ≈ 129.5 km².
| Square Kilometers (km²) | Square Miles (mi²) |
|---|---|
| 1 km² | 0.386102 mi² |
| 10 km² | 3.861022 mi² |
| 100 km² | 38.61022 mi² |
| 2.589988 km² | 1.0 mi² |
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