Square Miles to Square Kilometers Converter
Convert sq miles to sq km.
Result
0
Square Kilometers
1 Square Miles = 2.58999 Square Kilometers
How to convert Square Miles to Square Kilometers?
Square miles are common in the US/UK, while square kilometers are used in metric countries. The relationship is:
- 1 Square Mile = 2.58999 Square Kilometers
- 1 Square Kilometer ≈ 0.386102 Square Miles
To convert Square Miles to Square Kilometers, multiply by 2.58999.
Formula: Square Kilometers = Square Miles × 2.58999
Step-by-Step Calculation
- Take the number of Square Miles you want to convert (e.g., 10).
- Multiply that value by 2.58999.
- The result is the value in Square Kilometers. (Example: 10 × 2.58999 = 25.8999 km²).
How to use this converter?
Enter square miles and instantly get square kilometers—useful for maps, geography, and land comparisons.
Common Square Miles to Square Kilometers Conversions
Quick reference guide for common areas.
0.5 sq mi = 1.29499 km²
1 sq mi = 2.58999 km²
2 sq mi = 5.17998 km²
5 sq mi = 12.9499 km²
10 sq mi = 25.8999 km²
20 sq mi = 51.7998 km²
50 sq mi = 129.499 km²
100 sq mi = 258.999 km²
0.25 sq mi = 0.647498 km²
3 sq mi = 7.76997 km²
Tip: Area conversions scale fast
Because it’s squared units, small changes in distance can create large changes in area. Keep that in mind when comparing regions.
Common Square Miles to Square Kilometers Conversions
| Square Miles Input | Square Kilometers Result |
|---|---|
| 0.25 sq mi | 0.647498 km² |
| 0.5 sq mi | 1.29499 km² |
| 1 sq mi | 2.58999 km² |
| 2 sq mi | 5.17998 km² |
| 3 sq mi | 7.76997 km² |
| 5 sq mi | 12.9499 km² |
| 10 sq mi | 25.8999 km² |
| 20 sq mi | 51.7998 km² |
| 50 sq mi | 129.499 km² |
| 100 sq mi | 258.999 km² |
Frequently Asked Questions
How do I convert square miles to square kilometers?
Multiply square miles by 2.58999 to get square kilometers.
How many km² is 1 square mile?
1 square mile equals 2.58999 square kilometers.
How many square miles is 1 km²?
1 km² is about 0.386102 square miles.
Is 2.59 an exact value?
2.58999 is a rounded value; many tools round it to 2.59 for simplicity.
What is 10 square miles in km²?
10 square miles equals 25.8999 km².