Convert square miles (mi²) to square kilometers, hectares, acres, and other area units.
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The square mile (mi²) is a unit of area in the British Imperial system, equal to the area of a square with sides of one mile (1.609 km). Used in the US and the UK for measuring large territories — states, counties, and natural areas.
Common Square Mile Conversions
- 1 mi² = 640 acres — exact value by definition.
- 1 mi² ≈ 2.59 km² — multiply by 2.59 to get square kilometers.
- 1 mi² ≈ 259 ha — one square mile equals 259 hectares.
- 1 mi² = 3,097,600 yd² — exact value by definition.
- 1 mi² ≈ 27,878,400 ft² — one square mile equals nearly 28 million square feet.
Square miles are used to measure administrative units and natural landmarks in the US and the UK. For reference, the area of Manhattan is approximately 23 mi².