Convert Square Miles to Square Kilometers
1 mi² = 2.589988 km². Enter any value below.
Converted to every unit
Advertisement
Square Miles to Square Kilometers formula
km² = mi² × 2.589988
A square mile is 640 acres, about 2.59 square kilometers. A square kilometer is 1,000,000 square meters, or 100 hectares.
Worked example
To convert 5 mi², multiply by 2.589988: 5 mi² × 2.589988 = 12.949941 km².
Square Miles to Square Kilometers conversion table
| Square Miles | Square Kilometers |
|---|---|
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 3 mi² | 7.769964 km² |
| 4 mi² | 10.359952 km² |
| 5 mi² | 12.949941 km² |
| 6 mi² | 15.539929 km² |
| 7 mi² | 18.129917 km² |
| 8 mi² | 20.719905 km² |
| 9 mi² | 23.309893 km² |
| 10 mi² | 25.899881 km² |
| 12 mi² | 31.079857 km² |
| 15 mi² | 38.849822 km² |
| 20 mi² | 51.799762 km² |
| 25 mi² | 64.749703 km² |
| 30 mi² | 77.699643 km² |
| 40 mi² | 103.599524 km² |
| 50 mi² | 129.499406 km² |
| 75 mi² | 194.249108 km² |
| 100 mi² | 258.998811 km² |
| 250 mi² | 647.497028 km² |
| 500 mi² | 1,294.9941 km² |
| 1,000 mi² | 2,589.9881 km² |
Frequently asked questions
How many square kilometers are in a square mile?
1 mi² equals 2.589988 km².
How do I convert square miles to square kilometers?
Use the formula km² = mi² × 2.589988. For example, 5 mi² = 12.949941 km².
Last reviewed: October 2026 · Uses exact, internationally defined conversion factors.