Handy Units
Square Miles to Square Kilometersmi² → km²
1 mi² = 2.58999 km² · 1 km² = 0.386102 mi²
Formula
km² ≈ mi² × 2.58999
Example: 15 mi² = 15 × 2.58999 = 38.8498 km²
These units differ only by a fixed factor: multiply by it to convert, divide to go back. The factors are exact international definitions (for example 1 inch = 2.54 cm exactly); results are rounded only for display.
Square Miles and Square Kilometers chart
| Square Miles (mi²) | Square Kilometers (km²) |
|---|---|
| 1 mi² | 2.58999 km² |
| 2 mi² | 5.17998 km² |
| 3 mi² | 7.76996 km² |
| 4 mi² | 10.36 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 15 mi² | 38.8498 km² |
| 20 mi² | 51.7998 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.499 km² |
| 100 mi² | 258.999 km² |
| 500 mi² | 1,294.99 km² |
| 1,000 mi² | 2,589.99 km² |
| Square Kilometers (km²) | Square Miles (mi²) |
|---|---|
| 1 km² | 0.386102 mi² |
| 2 km² | 0.772204 mi² |
| 3 km² | 1.15831 mi² |
| 4 km² | 1.54441 mi² |
| 5 km² | 1.93051 mi² |
| 10 km² | 3.86102 mi² |
| 15 km² | 5.79153 mi² |
| 20 km² | 7.72204 mi² |
| 25 km² | 9.65255 mi² |
| 50 km² | 19.3051 mi² |
| 100 km² | 38.6102 mi² |
| 500 km² | 193.051 mi² |
| 1,000 km² | 386.102 mi² |
About these units
Square mile (mi²)1 sq mi ≈ 2.59 km²; used for US cities and states.
Square kilometer (km²)1 km² = 100 ha; used for the areas of cities and countries.
Questions
How many Square Kilometers are in 1 Square Miles?
1 mi² = 2.58999 km².
How many Square Miles are in 1 Square Kilometers?
1 km² = 0.386102 mi².