Conversion Formula
$$km² = mi² \times 2.58999$$
Multiply the value in Square Mile by 2.58999 to get Square Kilometer.
mi² to km² Conversion Table
| Square Mile (mi²) | Square Kilometer (km²) |
|---|---|
| 0.1 | 0.258999 |
| 0.5 | 1.29499 |
| 1 | 2.58999 |
| 2 | 5.17998 |
| 5 | 12.9499 |
| 10 | 25.8999 |
| 25 | 64.7497 |
| 50 | 129.499 |
| 100 | 258.999 |
| 250 | 647.497 |
| 500 | 1,294.99 |
| 1,000 | 2,589.99 |
mi² to km² in Engineering
Area conversions are essential for land development, building design, earthwork calculations, and property surveying. US engineers use acres and square feet, while international practice uses hectares and square meters.
Square Mile: Used for watershed areas, county planning, and large-scale land management. Equal to 640 acres.
Square Kilometer: Used for large land areas, watershed boundaries, and regional planning.