Square Mile to Square Kilometer Converter (mi² to km²)
1 square mile = 2.58999 square kilometer. A square mile is 2.58999 square kilometers.
Result
10 mi² = 25.899881 km²
How to convert square mile to square kilometer
A square mile is 2.58999 square kilometers. It is used for the area of cities, counties and countries in the US and UK, while the rest of the world quotes square kilometers.
Formula
km² = mi² × 2.58999
Worked example
10 mi² × 2.58999 = 25.8999 km²
Square Mile to Square Kilometer quick-reference table
| Square Mile (mi²) | Square Kilometer (km²) |
|---|---|
| 1 mi² | 2.58999 km² |
| 5 mi² | 12.9499 km² |
| 10 mi² | 25.8999 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.499 km² |
| 100 mi² | 258.999 km² |
Real-life examples
A city of 10 sq mi is 25.9 km2, and a 468 sq mi city is about 1,212 km2.
Frequently asked questions
How many km2 are in a square mile?
One square mile is 2.59 square kilometers.
How many acres are in a square mile?
A square mile is 640 acres.
What is 1 square mile in square kilometer?
1 square mile = 2.58999 square kilometer (mi² to km²).
What is the formula to convert mi² to km²?
km² = mi² × 2.58999. For example, 10 mi² × 2.58999 = 25.8999 km².
How do I convert km² back to mi²?
Use the reverse converter: 1 square kilometer = 0.386102 square mile. Check: 25.8999 km² converts back to 10 mi².
Reverse conversion
Need the other direction? Square Kilometer to Square Mile converter (km² to mi²): 1 square kilometer = 0.386102 square mile.
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