Square Miles to Square Kilometres
Convert square miles (mi²) to square kilometres (km²) instantly — with formula and reference table.
mi²
km²
Quick answer: 1 mi² = 2.589988 km². To convert square miles to square kilometres, multiply by mi² × 2.589988.
Converting square miles to square kilometres
This converter changes a value in square miles (mi²) into square kilometres (km²). One square mile equals 2.589988 km². One square mile equals 2.59 square kilometres. The conversion runs entirely in your browser — enter a value and the result updates instantly, in either direction.
Formula
km² = mi² × 2.589988
Example
Convert 10 mi² to km²: 10 × 2.589988 = 25.899881 km².
Square Miles to Square Kilometres conversion table
| Square Miles (mi²) | Square Kilometres (km²) |
|---|---|
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 3 mi² | 7.769964 km² |
| 5 mi² | 12.949941 km² |
| 10 mi² | 25.899881 km² |
| 20 mi² | 51.799762 km² |
| 25 mi² | 64.749703 km² |
| 50 mi² | 129.499406 km² |
| 100 mi² | 258.998811 km² |
How to use this converter
- Enter a value in the square miles (mi²) field.
- Read the converted value in square kilometres (km²) below.
- Type into the km² field instead to convert in reverse, or use the swap button.
Frequently asked questions
How many square kilometres are in a square mile?
1 square mile equals 2.59 square kilometres.
How do I convert 50 sq miles to sq km?
50 times 2.59 = 129.5 square kilometres.
How large is a square mile?
A square mile is 640 acres or about 2.59 square kilometres.