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.

Square miles (mi²) to Acres (ac) Conversion

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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) to Acres (ac) - Conversion Table
Square miles (mi²)	Acres (ac)
0.1 mi²	64 ac
1 mi²	640 ac
2 mi²	1280 ac
3 mi²	1920 ac
5 mi²	3200 ac
10 mi²	6400 ac
20 mi²	12800 ac
30 mi²	19200 ac
50 mi²	32000 ac
100 mi²	64000 ac
1000 mi²	640000 ac

Convert Square miles (mi²) to other units of Area

List of Conversions
‣ Square miles (mi²) to square meters (m²)
‣ Square miles (mi²) to square kilometers (km²)
‣ Square miles (mi²) to square centimeters (cm²)
‣ Square miles (mi²) to square millimeters (mm²)
‣ Square miles (mi²) to square feet (ft²)
‣ Square miles (mi²) to square inches (in²)
‣ Square miles (mi²) to square yards (yd²)
‣ Square miles (mi²) to hectares (ha)
‣ Square miles (mi²) to acres (ac)