Square Mile (mi²)
The square mile (mi²) is the area of a square with 1 mile sides: 640 acres, or about 2.59 km².
Symbol: mi² (ASCII: mi2)
Quantity: area
SI relation: 1 mi² = 2589988.110336 m² (exact)
Derivation: 1 mi² = (1609.344 m)² = 2 589 988.110336 m² = 640 acres
Exact: yes, by definition
Typical uses
- US city and county areas
- Wildfire and flood extents
- Population density in the US
Convert square miles to other units
| Conversion | 1 mi² equals | Reverse |
|---|---|---|
| square mile to square meter | 2589988.11 m² | square meter to square mile |
| square mile to square centimeter | 25899881100 cm² | square centimeter to square mile |
| square mile to square foot | 27878400 ft² | square foot to square mile |
| square mile to square inch | 4014489600 in² | square inch to square mile |
| square mile to hectare | 258.998811 ha | hectare to square mile |
| square mile to acre | 640 ac | acre to square mile |
| square mile to square millimeter | 2589988110000 mm² | square millimeter to square mile |
| square mile to square kilometre | 2.58998811 km² | square kilometre to square mile |
| square mile to square yard | 3097600 yd² | square yard to square mile |
Open the Area Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square mile (mi²)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Square Mile (mi²). Retrieved October 25, 2026, from https://scientificconverters.com/units/square-mile/
IEEE
Scientific Converters, "Square Mile (mi²)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/square-mile/