Acres (ac) to Square miles (mi²) Conversion
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
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 (ac) | Square miles (mi²) |
|---|---|
| 0.1 ac | 0.000156 mi² |
| 1 ac | 0.00156 mi² |
| 2 ac | 0.00312 mi² |
| 3 ac | 0.00469 mi² |
| 5 ac | 0.00781 mi² |
| 10 ac | 0.0156 mi² |
| 20 ac | 0.0312 mi² |
| 30 ac | 0.0469 mi² |
| 50 ac | 0.0781 mi² |
| 100 ac | 0.1562 mi² |
| 1000 ac | 1.5625 mi² |
Frequently Asked Questions (FAQ)
How many square miles are in 1 acres?
1 acres (ac) is exactly 0.001563 square miles (mi²).
How do I convert acres to square miles?
Multiply the value in acres by 0.001563 to get the result in square miles. Or use the converter above — type any number and see the result instantly.