Square mile (mi²)

Definition

Exactly 2 589 988.110336 m² (1609.344 m squared).

History

The square mile is a square one mile on each side, built from the statute mile. It equals about 2.59 square kilometers, or 640 acres.

Where it is used

Square miles measure land, counties and regions in the United States and United Kingdom.

Typical uses include land and county area.

Conversion pages

These pages convert square mile to or from another unit in area.

No conversion pages use this unit yet.

Other Area units

• Square meter (m²)
• Square foot (ft²)
• Square inch (in²)
• Square centimeter (cm²)
• Square kilometer (km²)
• Acre (ac)
• Hectare (ha)
• Square yard (yd²)

Sources

• NIST HB 44 NIST Handbook 44, Appendix C (area); 1959 yard-and-pound agreement · Dataset reviewed Nov 11, 2026