Convert Square Mile to Square Kilometer
Use this free converter to change square miles (mi²) into square kilometers (km²). Square mile and square kilometer both measure area. As a quick reference, 1 mi² equals 2.5899881 km², and 1 km² equals 0.38610216 mi².
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Square Kilometer (km²)
2.5899881
1 mi² = 2.5899881 km²
Area conversion table
| Square Mile | Square Kilometer |
|---|---|
| 0.01 | 0.025899881 |
| 0.1 | 0.25899881 |
| 0.5 | 1.2949941 |
| 1 | 2.5899881 |
| 2 | 5.1799762 |
| 3 | 7.7699643 |
| 5 | 12.949941 |
| 10 | 25.899881 |
| 20 | 51.799762 |
| 25 | 64.749703 |
| 50 | 129.49941 |
| 100 | 258.99881 |
| 1,000 | 2589.9881 |
How to convert Square Mile to Square Kilometer
Multiply the square mile value by 2.5899881 to get square kilometers.
- Enter the number of square miles you want to convert.
- The converter instantly shows the equivalent value in square kilometers.
- Worked example: 15 mi² × 2.5899881 = 38.849822 km².
- Use the swap button to reverse the conversion (square kilometer to square mile).
About these units
Square Mile (mi²)
- Definition
- A square mile (mi²) is the area of a square one mile on each side, about 2.59 square kilometers.
- History
- It derives from the statute mile of English origin.
- Current use
- Square miles express land area and population density in the US and UK.
Square Kilometer (km²)
- Definition
- A square kilometer (km²) is the area of a square one kilometer on each side, equal to 1,000,000 square meters.
- History
- It is a metric multiple of the square meter for large areas.
- Current use
- Square kilometers measure the area of cities, regions, lakes, and countries.
Frequently asked questions
How many square kilometers are in a square mile?
There are 2.5899881 km² in 1 mi². To convert, multiply the number of square miles by 2.5899881.
How do I convert square miles to square kilometers?
Multiply the square mile value by 2.5899881 to get square kilometers. For example, 10 mi² = 25.899881 km².
Is this square mile-to-square kilometer converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Square Mile to other area units
| Unit | 1 Square Mile equals |
|---|---|
| Square Meter (m²) | 2589988.1 m² |
| Square Kilometer (km²) | 2.5899881 km² |
| Square Centimeter (cm²) | 25899881000 cm² |
| Square Yard (yd²) | 3097600 yd² |
| Square Foot (ft²) | 27878400 ft² |
| Square Inch (in²) | 4014489600 in² |
| Acre (ac) | 640 ac |
| Hectare (ha) | 258.99881 ha |