Convert square miles to square kilometers
Square mile (mi²) to square kilometer (km²). One square mile equals 2.59 square kilometers.
Formula
Square mile to square kilometer conversion table
| Square miles | Square kilometers | Square kilometers | Square miles |
|---|---|---|---|
| 1 mi² | 2.59 km² | 1 km² | 0.386102 mi² |
| 2 mi² | 5.18 km² | 2 km² | 0.772204 mi² |
| 3 mi² | 7.77 km² | 3 km² | 1.1583 mi² |
| 5 mi² | 12.9499 km² | 5 km² | 1.9305 mi² |
| 10 mi² | 25.8999 km² | 10 km² | 3.861 mi² |
| 20 mi² | 51.7998 km² | 20 km² | 7.722 mi² |
| 50 mi² | 129.5 km² | 50 km² | 19.3051 mi² |
| 100 mi² | 259 km² | 100 km² | 38.6102 mi² |
| 500 mi² | 1294.99 km² | 500 km² | 193.05 mi² |
| 1000 mi² | 2589.99 km² | 1000 km² | 386.1 mi² |
To convert square miles to square kilometers, multiply the number of square miles by 2.59. One square mile equals 2.59 square kilometers, and one square kilometer equals 0.386102 square miles, so the relationship is fixed and exact. As a worked example, 10 mi² comes to 25.8999 km². Enter your own figure in the converter above to get an instant answer, or use the swap button to flip the direction. This is a area conversion, and like every tool on UnitGlide it runs locally in your browser with no account or upload required. The table further down shows a range of common square mile values already worked out in square kilometers, plus the reverse square kilometer to square mile direction, which is handy for quick reference or double-checking a result by hand.
Frequently asked questions
How many square kilometers are in a square mile?
One square mile equals 2.59 square kilometers. The ratio is constant, so you can multiply any number of square miles by 2.59 to get square kilometers.
What is the formula to convert square miles to square kilometers?
Use square kilometers = square miles × 2.59. UnitGlide applies this exact formula for every value, so results stay accurate across the whole range.
How do I convert square kilometers back to square miles?
Go the other way by using one square kilometer equals 0.386102 square miles. You can also press the swap button in the converter above to flip the direction in one click.
Is this square mile to square kilometer converter accurate?
Yes. It uses internationally defined SI conversion factors, as maintained by the BIPM, and all math runs in your browser so nothing is rounded away on a server. For everyday use the displayed precision is more than enough.