Square Miles to Square Kilometers Converter
Convert square miles (mi²) to square kilometers (km²). Type a number in either box and the result appears as you type.
Enter a number, for example 12.5
1 square mile = 2.58998811 square kilometers
Formula: km² = mi² × 2.58998811
How to convert square miles to square kilometers
1 square mile = 2.58998811 square kilometers
To convert square miles to square kilometers, multiply the value by 2.58998811.
Example: 5 mi² × 2.58998811 = 12.94994055 km²
Square Miles to Square Kilometers conversion table
| Square mile (mi²) | Square kilometer (km²) |
|---|---|
| 1 | 2.5899881 |
| 2 | 5.1799762 |
| 3 | 7.7699643 |
| 4 | 10.359952 |
| 5 | 12.949941 |
| 10 | 25.899881 |
| 15 | 38.849822 |
| 20 | 51.799762 |
| 25 | 64.749703 |
| 50 | 129.49941 |
| 75 | 194.24911 |
| 100 | 258.99881 |
| 250 | 647.49703 |
| 500 | 1,294.9941 |
| 1,000 | 2,589.9881 |
About square miles and square kilometers
Square mile (mi²)
640 acres, about 2.59 square kilometers.
Square kilometer (km²)
1,000,000 square meters, or 100 hectares. Used for the areas of cities and countries.
Frequently asked questions
What is 1 mi² in square kilometers?
1 mi² = 2.58998811 km².
What is 1 km² in square miles?
1 km² = 0.3861021585 mi².
How do I convert square miles to square kilometers?
To convert square miles to square kilometers, multiply the value by 2.58998811. 1 square mile = 2.58998811 square kilometers.