How many square kilometers are in a square mile?
One square mile is approximately 2.58999 square kilometers (international).
Detailed answer
One international mile is 1,609.344 m, so one square mile is (1,609.344)² m² ≈ 2,589,988.110336 m² = about 2.589988 km². Use precise factors for surveying-grade work.
Relationship context
Square miles are US/UK for large land areas; square kilometers are metric. Geography and environmental data often convert between them.
Quick conversion table
| Square Mile (mi2) | Square Kilometer (km2) |
|---|---|
| 0.1 | 0.258998811 |
| 1 | 2.5899881103 |
| 2 | 5.1799762207 |
| 3 | 7.769964331 |
| 4 | 10.3599524413 |
| 5 | 12.9499405517 |
| 6 | 15.539928662 |
| 7 | 18.1299167724 |
| 8 | 20.7199048827 |
| 9 | 23.309892993 |
| Square Mile (mi2) | Square Kilometer (km2) |
|---|---|
| 10 | 25.8998811034 |
| 20 | 51.7997622067 |
| 30 | 77.6996433101 |
| 40 | 103.599524413 |
| 50 | 129.499405517 |
| 60 | 155.39928662 |
| 70 | 181.299167724 |
| 80 | 207.199048827 |
| 90 | 233.09892993 |
| 100 | 258.998811034 |
More Square Miles converters
Dedicated pages from Square Mile to every other common area unit (square meter, square kilometer, hectare, acre, square feet, square yard, square inch, square mile).
- sq-mile to sq-m (Square Mile to Square Meter)
- sq-mile to sq-cm (Square Mile to Square Centimeter)
- sq-mile to sq-km (Square Mile to Square Kilometer)
- sq-mile to hectare (Square Mile to Hectare)
- sq-mile to decare (Square Mile to Decare)
- sq-mile to are (Square Mile to Are)
- sq-mile to acre (Square Mile to Acre)
- sq-mile to pyeong (Square Mile to Pyeong)
- sq-mile to tsubo (Square Mile to Tsubo)
- sq-mile to sq-ft (Square Mile to Square Feet)
- sq-mile to sq-yard (Square Mile to Square Yard)
- sq-mile to sq-inch (Square Mile to Square Inch)