How to convert square miles to square kilometers
Square Miles and Square Kilometers both measure area, so converting is a single multiplication. One mi² equals 2.589988 km², so you multiply your square miles value by 2.589988.
Formula: square kilometers = square miles × 2.589988. For example, 10 mi² = 25.899881 km².
Square Miles to Square Kilometers conversion table
| Square Miles (mi²) | Square Kilometers (km²) |
|---|---|
| 1 | 2.589988 |
| 2 | 5.179976 |
| 5 | 12.949941 |
| 10 | 25.899881 |
| 25 | 64.749703 |
| 50 | 129.499406 |
| 100 | 258.998811 |
| 1,000 | 2,589.98811 |
Square Miles and Square Kilometers explained
Square Miles (mi²): An imperial unit for large areas of land.
Square Kilometers (km²): One million square metres, used for regions and countries.
When you'd convert square miles to square kilometers
You'll convert square miles to square kilometers whenever a measurement is given in one unit but you need it in the other — comparing square miles and square kilometers figures across regions, following a recipe or spec, or double-checking a number. Because 1 mi² is exactly 2.589988 km², the result is precise every time.
Frequently asked questions
How many square kilometers are in a square mile?
One mi² equals 2.589988 km². Multiply your square miles figure by 2.589988 to get square kilometers.
What is the formula to convert square miles to square kilometers?
square kilometers = square miles × 2.589988. The factor 2.589988 is exact.
What is 2 square miles in square kilometers?
2 mi² = 5.179976 km². You can enter any value in the converter above to get an instant result.
Is this Square Miles to Square Kilometers converter accurate?
Yes. It uses the standard conversion factor (1 mi² = 2.589988 km²) defined by BIPM — SI Brochure (derived units), so results are exact to several decimal places.