How to convert square miles to square kilometers
To convert square miles (mi²) to square kilometers (km²), multiply the value in square miles by 2.58998811034.
km² = mi² × 2.58998811034
Example: 5 mi² = 12.94994055 km².
You can also type 5 mi² to km² into the smart calculator, or mix units: 1 mi² + 1 km².
Square Miles to Square Kilometers conversion table
| Square Miles | Square Kilometers |
|---|---|
| 0.01 mi² | 0.025899881 km² |
| 0.1 mi² | 0.25899881 km² |
| 0.25 mi² | 0.64749703 km² |
| 0.5 mi² | 1.2949941 km² |
| 1 mi² | 2.5899881 km² |
| 2 mi² | 5.1799762 km² |
| 3 mi² | 7.7699643 km² |
| 4 mi² | 10.359952 km² |
| 5 mi² | 12.949941 km² |
| 6 mi² | 15.539929 km² |
| 7 mi² | 18.129917 km² |
| 8 mi² | 20.719905 km² |
| 9 mi² | 23.309893 km² |
| 10 mi² | 25.899881 km² |
| 12 mi² | 31.079857 km² |
| 15 mi² | 38.849822 km² |
| 20 mi² | 51.799762 km² |
| 25 mi² | 64.749703 km² |
| 30 mi² | 77.699643 km² |
| 40 mi² | 103.59952 km² |
| 50 mi² | 129.49941 km² |
| 60 mi² | 155.39929 km² |
| 75 mi² | 194.24911 km² |
| 100 mi² | 258.99881 km² |
| 250 mi² | 647.49703 km² |
| 500 mi² | 1,294.9941 km² |
| 1,000 mi² | 2,589.9881 km² |
Converting square kilometers back to square miles
1 km² = 0.3861021585 mi². See the Square Kilometers to Square Miles converter, or press the swap button above.
About the units
Square mile (mi²)
Exactly 640 acres, about 2.59 square kilometers.
Square kilometer (km²)
A unit of area.
Area measures a two-dimensional surface. The SI unit is the square meter. Property is often measured in square feet, while land uses acres or hectares: one hectare is 10,000 square meters, about 2.471 acres.
Questions and answers
How many square kilometers are in a square mile?
One square mile (mi²) equals 2.58998811 square kilometers (km²).
How do I convert square miles to square kilometers?
To convert square miles to square kilometers, multiply the value in square miles by 2.58998811034. The formula is km² = mi² × 2.58998811034. For example, 5 mi² = 12.949941 km².
What is 5 mi² in km²?
5 square miles is 12.94994055 square kilometers.
Which is bigger, a square mile or a square kilometer?
A square mile is bigger: 1 mi² = 2.58998811 km².
How big is an acre?
An acre is exactly 43,560 square feet, about 4,047 square meters or 0.405 hectares. A hectare is about 2.471 acres.
Does this mi² to km² converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.