How to use Square Miles to Square Kilometers
Type a value in square miles and the square kilometers figure appears straight away. The conversion table further down lists common values.
The formula
km² = mi² × 2.58998811
Examples
- 1 square miles to square kilometers
2.58998811 km²
- 10 square miles to square kilometers
25.8998811 km²
- 250 square miles to square kilometers
647.4970275 km²
Square Miles to Square Kilometers conversion table
| Square Miles | Square Kilometers |
|---|---|
| 1 | 2.59 km² |
| 2 | 5.18 km² |
| 3 | 7.77 km² |
| 4 | 10.36 km² |
| 5 | 12.9499 km² |
| 6 | 15.5399 km² |
| 7 | 18.1299 km² |
| 8 | 20.7199 km² |
| 9 | 23.3099 km² |
| 10 | 25.8999 km² |
| 15 | 38.8498 km² |
| 20 | 51.7998 km² |
| 25 | 64.7497 km² |
| 30 | 77.6996 km² |
| 40 | 103.5995 km² |
| 50 | 129.4994 km² |
| 75 | 194.2491 km² |
| 100 | 258.9988 km² |
| 250 | 647.497 km² |
| 500 | 1,294.9941 km² |
| 1,000 | 2,589.9881 km² |
Limitations and assumptions
Review inputs, units and assumptions before relying on the result. Detailed content, accessibility and edge-case review remains ongoing.
Frequently asked questions
How many square kilometers are in one square miles?
One square miles equals 2.58998811 km². The formula is km² = mi² × 2.58998811.
How do I convert square miles to square kilometers?
Use km² = mi² × 2.58998811. For example, 10 square miles gives 25.8998811 km². Enter your own value above and the converter does the arithmetic for you.
How do I convert square kilometers back to square miles?
Use the Square Kilometers to Square Miles converter, or invert the factor by dividing instead of multiplying.
Is this conversion exact?
Area factors are the square of the matching length factor, so a small error in a length conversion grows when you convert area.