Convert Acres to Square Miles

Enter the area in acres below to get the value converted to square miles.

Results in Square Miles:
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1 ac = 0.001563 sq mi

How to Convert Acres to Square Miles

conversion scale showing acres and equivalent square miles area values

To convert a acre measurement to a square mile measurement, multiply the area by the conversion ratio. One acre is equal to 0.001563 square miles, so use this simple formula to convert:

square miles = acres × 0.001563

The area in square miles is equal to the acres multiplied by 0.001563.

For example, here's how to convert 5 acres to square miles using the formula above.
5 ac = (5 × 0.001563) = 0.007813 sq mi

Acres and square miles are both units used to measure area. Keep reading to learn more about each unit of measure.


One acre is defined as the area equal to a space that is one chain (66 ft) by one furlong (660 ft), or 10 square chains. That's equal to 43,560 square feet for those unfamiliar with those units of measure.

The acre is a US customary and imperial unit of area. Acres can be abbreviated as ac, for example 1 acre can be written as 1 ac.

Try our acreage calculator to find the area of a plot of land in acres by locating the boundaries on a map.

Square Miles

One square mile is equal to the area of a square with sides that are 1 mile long. One square mile is roughly equal to 2.59 square kilometers.

The square mile is a US customary and imperial unit of area. Square miles can be abbreviated as sq mi, and are also sometimes abbreviated as mi². For example, 1 square mile can be written as 1 sq mi or 1 mi².

Acre Measurements and Equivalent Square Mile Conversions

Common acre values converted to the equivalent square mile value
Acres Square Miles
1 ac 0.001563 sq mi
2 ac 0.003125 sq mi
3 ac 0.004688 sq mi
4 ac 0.00625 sq mi
5 ac 0.007813 sq mi
6 ac 0.009375 sq mi
7 ac 0.010938 sq mi
8 ac 0.0125 sq mi
9 ac 0.014063 sq mi
10 ac 0.015625 sq mi
11 ac 0.017188 sq mi
12 ac 0.01875 sq mi
13 ac 0.020313 sq mi
14 ac 0.021875 sq mi
15 ac 0.023438 sq mi
16 ac 0.025 sq mi
17 ac 0.026563 sq mi
18 ac 0.028125 sq mi
19 ac 0.029688 sq mi
20 ac 0.03125 sq mi
21 ac 0.032813 sq mi
22 ac 0.034375 sq mi
23 ac 0.035938 sq mi
24 ac 0.0375 sq mi
25 ac 0.039063 sq mi
26 ac 0.040625 sq mi
27 ac 0.042188 sq mi
28 ac 0.04375 sq mi
29 ac 0.045313 sq mi
30 ac 0.046875 sq mi
31 ac 0.048438 sq mi
32 ac 0.05 sq mi
33 ac 0.051563 sq mi
34 ac 0.053125 sq mi
35 ac 0.054688 sq mi
36 ac 0.05625 sq mi
37 ac 0.057813 sq mi
38 ac 0.059375 sq mi
39 ac 0.060938 sq mi
40 ac 0.0625 sq mi

More Acre Area Conversions

US Customary
Convert to Square Yards
1 ac is equal to 4,840 square yards
Convert to Square Feet
1 ac is equal to 43,560 square feet
Convert to Square Inches
1 ac is equal to 6,272,640 square inches
SI Units
Convert to Square Kilometers
1 ac is equal to 0.004047 square kilometers
Convert to Square Meters
1 ac is equal to 4,046.86 square meters
Convert to Square Centimeters
1 ac is equal to 40,468,564.2 square centimeters
Convert to Square Millimeters
1 ac is equal to 4,046,856,422.4 square millimeters
Other Metric Units
Convert to Hectares
1 ac is equal to 0.404686 hectares
Convert to Ares
1 ac is equal to 40.468564 ares