# Acres to Square Miles (ac to mi²)

## Acres to Square Miles (ac to mi²) conversion calculator

Square Miles to Acres (Swap units)

1ac = 0.00156mi²

Note: You can increase or decrease the accuracy of this answer by selecting the number of significant figures required from the options above the result.

### Acres to Square Miles conversion formula

Square Miles = Acres / 640

### Acres to Square Miles calculation

Square Miles = Acres / 640

Square Miles = 1 / 639.99927480303

Square Miles = 0.00156

## How do I convert acres to square miles?

To convert acres to square miles, you need to know that 1 acre is equal to 0.0015625 square miles. This conversion factor can be used to easily convert between the two units of area measurement.

For example, if you have 100 acres of land and want to know how many square miles that is, you would multiply 100 acres by 0.0015625 square miles per acre to get 0.15625 square miles.

## What are Acres?

Acres are units of measurement used to quantify land area. An acre is a unit of area commonly used in the imperial and US customary systems, equal to 43,560 square feet or about 4,047 square meters. Originally, an acre was defined as the amount of land a yoke of oxen could plow in one day. Acres are commonly used in real estate and agriculture to measure the size of land parcels.

While acres are more commonly used in the United States and some other countries following the imperial system, hectares are the preferred unit of measurement in most of the world due to their simplicity and compatibility with the metric system.

## What are Square Miles?

Square miles and hectares are both units of area measurement, but they belong to different systems of measurement. A square mile is a unit of area commonly used in the United States and the United Kingdom. It is equivalent to the area of a square with sides that are one mile long. One square mile is equal to 640 acres or approximately 2.59 square kilometers. Square miles are often used to measure large areas of land, such as states or countries.

Square miles and hectares are both important units of measurement for determining the size of land areas, with square miles being more common in the US and UK, while hectares are widely used in the metric system.

Starting value
Increment
Accuracy
Acres
Square Miles
0ac
0.00000mi²
1ac
0.00156mi²
2ac
0.00313mi²
3ac
0.00469mi²
4ac
0.00625mi²
5ac
0.00781mi²
6ac
0.00938mi²
7ac
0.01094mi²
8ac
0.01250mi²
9ac
0.01406mi²
10ac
0.01563mi²
11ac
0.01719mi²
12ac
0.01875mi²
13ac
0.02031mi²
14ac
0.02188mi²
15ac
0.02344mi²
16ac
0.02500mi²
17ac
0.02656mi²
18ac
0.02813mi²
19ac
0.02969mi²
Acres
Square Miles
20ac
0.03125mi²
21ac
0.03281mi²
22ac
0.03438mi²
23ac
0.03594mi²
24ac
0.03750mi²
25ac
0.03906mi²
26ac
0.04063mi²
27ac
0.04219mi²
28ac
0.04375mi²
29ac
0.04531mi²
30ac
0.04688mi²
31ac
0.04844mi²
32ac
0.05000mi²
33ac
0.05156mi²
34ac
0.05313mi²
35ac
0.05469mi²
36ac
0.05625mi²
37ac
0.05781mi²
38ac
0.05938mi²
39ac
0.06094mi²
Acres
Square Miles
40ac
0.06250mi²
41ac
0.06406mi²
42ac
0.06563mi²
43ac
0.06719mi²
44ac
0.06875mi²
45ac
0.07031mi²
46ac
0.07188mi²
47ac
0.07344mi²
48ac
0.07500mi²
49ac
0.07656mi²
50ac
0.07813mi²
51ac
0.07969mi²
52ac
0.08125mi²
53ac
0.08281mi²
54ac
0.08438mi²
55ac
0.08594mi²
56ac
0.08750mi²
57ac
0.08906mi²
58ac
0.09063mi²
59ac
0.09219mi²
Acres
Square Miles
60ac
0.09375mi²
61ac
0.09531mi²
62ac
0.09688mi²
63ac
0.09844mi²
64ac
0.10000mi²
65ac
0.10156mi²
66ac
0.10313mi²
67ac
0.10469mi²
68ac
0.10625mi²
69ac
0.10781mi²
70ac
0.10938mi²
71ac
0.11094mi²
72ac
0.11250mi²
73ac
0.11406mi²
74ac
0.11563mi²
75ac
0.11719mi²
76ac
0.11875mi²
77ac
0.12031mi²
78ac
0.12188mi²
79ac
0.12344mi²