Convert Square miles to Square kilometers
1 mi² = 2.58998811 km². Enter any amount below — it is converted to Square kilometers and every other unit at once, using exact conversion factors.
Area conversion
All conversions use the exact definition of each unit expressed in square meters. The imperial factors are exact squares of the length definitions: 1 ft = 0.3048 m, so 1 ft² = 0.09290304 m² exactly. The area is first converted to m², then into the target unit: result = area × factor(from) ÷ factor(to). Example: 50 m² → 538.2 ft².
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Conversion table
| Square miles (mi²) | Square kilometers (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 |
| 25 mi² | 64.749703 km² |
| 50 mi² | 129.499406 km² |
| 100 mi² | 258.998811 km² |
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