Convert square miles to square kilometres
Enter a value in square miles (mi²) to get square kilometres (km²). One square mile is 2.59 square kilometres; one square kilometre is 0.386102 square miles.
How to use the Square mile to square kilometre
- Type the number of square miles.
- Click Convert.
- Read the result in square kilometres, plus the same value in every other area unit.
mi² to km² formula
square kilometres = square miles × 2.59. To go the other way, square miles = square kilometres × 0.386102 (see square kilometres to square miles).
Worked example
12 mi² × 2.59 = 31.0799 km².
Square miles to square kilometres conversion table
| Square miles | Square kilometres |
|---|---|
| 0.1 mi² | 0.258999 km² |
| 0.5 mi² | 1.295 km² |
| 1 mi² | 2.59 km² |
| 2 mi² | 5.18 km² |
| 3 mi² | 7.77 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 20 mi² | 51.7998 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
| 250 mi² | 647.497 km² |
| 500 mi² | 1,294.99 km² |
| 1,000 mi² | 2,589.99 km² |
About the square mile
640 acres, about 2.59 km². Counties and cities in the USA.
About the square kilometre
One million square metres, or 100 hectares. Cities and countries.
Related conversions
Frequently asked questions
How many square kilometres in a square mile?
2.59 square kilometres.
How many square miles in a square kilometre?
0.386102 square miles.
Is the factor exact?
The factor 2.59 is derived from the units' exact definitions; only the display is rounded.
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Last updated 2026-09-23.