Square miles to Square kilometers Converter
Convert square miles to square kilometers instantly. 1 mi² = 2.59 km². Free two-way converter with the formula and a quick reference table.
How to convert square miles to square kilometers
square kilometers = square miles × 2.59
One square mile equals 2.59 square kilometers, so to convert square miles to square kilometers you multiply by 2.59. Going the other way, one square kilometer is 0.386102 square miles. Both units measure area, so the conversion is an exact ratio that never changes.
10 square miles = 25.8999 square kilometers. Multiply your square mile figure by the factor above (or just type it into the box) to convert any amount.
Need the other direction? square kilometers to square miles
square miles to square kilometers table
| square miles (mi²) | square kilometers (km²) |
|---|---|
| 1 | 2.59 |
| 2 | 5.18 |
| 3 | 7.77 |
| 5 | 12.9499 |
| 10 | 25.8999 |
| 20 | 51.7998 |
| 25 | 64.7497 |
| 50 | 129.5 |
| 100 | 259 |
| 250 | 647.5 |
| 500 | 1,294.99 |
| 1,000 | 2,589.99 |
Frequently asked questions
How many square kilometers are in a square mile?
One square mile equals 2.59 square kilometers. So to convert, multiply the number of square miles by 2.59.
How do I convert square miles to square kilometers?
Multiply by 2.59, or simply enter the value in the converter above — it does the math instantly and works both ways.
Is this conversion exact?
Yes — both units measure the same quantity, so the ratio is fixed and this uses the standard internationally-agreed factor.