Square miles (mi²) to Acres (ac) Conversion
Square miles
The square mile is a unit of area equal to exactly 2,589,988.110336 square metres (approximately 2.59 km²). It is the standard unit for measuring large land areas, population density, and political jurisdictions in the United States and United Kingdom. One square mile contains exactly 640 acres — the basis of the US Public Land Survey System that structured much of North American land division.
Acres
The acre is a unit of area equal to exactly 4,046.8564224 square metres, the standard unit for land measurement in the United States and United Kingdom. Its origin lies in medieval English agriculture: an acre was the amount of land a yoke of oxen could plough in a single day, standardised as a furlong (220 yards) long and a chain (22 yards) wide — exactly 43,560 square feet. One square mile contains exactly 640 acres.
| Square miles (mi²) | Acres (ac) |
|---|---|
| 0.1 mi² | 64.00 ac |
| 1 mi² | 640.00 ac |
| 2 mi² | 1,280.00 ac |
| 3 mi² | 1,920.00 ac |
| 5 mi² | 3,200.00 ac |
| 10 mi² | 6,400.00 ac |
| 20 mi² | 12,800.00 ac |
| 30 mi² | 19,200.00 ac |
| 50 mi² | 32,000.00 ac |
| 100 mi² | 64,000.00 ac |
| 1000 mi² | 640,000.00 ac |
Frequently Asked Questions (FAQ)
How many acres are in 1 square miles?
1 square miles (mi²) is exactly 640.000 acres (ac).
How do I convert square miles to acres?
Multiply the value in square miles by 640.000 to get the result in acres. Or use the converter above — type any number and see the result instantly.