Square Miles to Square Kilometers
1 Square Mile = 2.59 Square Kilometers
Common amounts:
About the square mile to square kilometer conversion
The square mile (mi²) and the square kilometer (km²) are both units of area. Convert between area units — square meters, square kilometers, hectares, acres, square feet, square yards and square miles.
To convert square miles to square kilometers, multiply by 2.59. To go back, multiply square kilometers by 0.3861.
Reference table
| Square Miles | Square Kilometers |
|---|---|
| 1 mi² | 2.59 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
Need the reverse conversion? Convert Square Kilometers to Square Miles.
Convert Square Mile to other area units
Frequently asked questions
- How many square kilometers is 1 square mile?
- 1 Square Mile equals 2.59 Square Kilometers. To go the other way, 1 Square Kilometer equals 0.3861 Square Miles.
- What's the formula to convert square miles to square kilometers?
- Multiply the number of square miles by 2.59 to get square kilometers. For example, 10 square miles × 2.59 = 25.8999 square kilometers.
- Does this converter handle decimals and very large numbers?
- Yes. Type any real number, including decimals or values in the trillions. Math runs entirely in your browser — no server round-trip, no sign-up, and nothing to install.