Square Miles to Acres Conversion

How many acres in a square mile?

To convert between square miles and acres please use the conversion tool below. Enter a square mile or an acre value into the converter and the result will be displayed.

Round:
Enter Square Mile
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Enter Acre

► acres to square miles

► area conversion

Square miles to acres area units conversion factor is 640. To find out how many acres in square miles, multiply by the conversion factor or use the converter.

1 Square Mile = 640 Acres

There are 640 acres in a square mile, because an acre is defined as an area of 66 feet to 660 feet and equals to 66 * 660 = 43560 square feet and one mile is 5280 feet and one sq. mile equals to 5280 * 5280 = 27878400 square feet, that makes 27878400 / 43560 = 640 acres in a square mile.

For example, to find out how many acres there are in a square mile and a half, as a formula to convert from sq. miles to acres, multiply the sq. mile value by 640, that makes 1.5 mi2 * 640 = 960 acres in 1.5 sq. miles.

Square mile and acre are imperial and US Customary area units and one square mile equals to 640 acres and 259 hectares. The abbreviations are "mi2" and "ac".

Create Custom Conversion Table
To create your own custom conversion table click "Create Table" botton. To change values, you may enter a "Start" value (1, 2.5, 5 etc), select a an "Increment" value (0.01, 5, 100 etc) and select an "Accuracy" value to round the result.

Sq. Miles to Acres Conversion Table

Sq. Mile Acre Sq. Mile Acre Sq. Mile Acre Sq. Mile Acre
1 640 26 16640 51 32640 76 48640
2 1280 27 17280 52 33280 77 49280
3 1920 28 17920 53 33920 78 49920
4 2560 29 18560 54 34560 79 50560
5 3200 30 19200 55 35200 80 51200
6 3840 31 19840 56 35840 81 51840
7 4480 32 20480 57 36480 82 52480
8 5120 33 21120 58 37120 83 53120
9 5760 34 21760 59 37760 84 53760
10 6400 35 22400 60 38400 85 54400
11 7040 36 23040 61 39040 86 55040
12 7680 37 23680 62 39680 87 55680
13 8320 38 24320 63 40320 88 56320
14 8960 39 24960 64 40960 89 56960
15 9600 40 25600 65 41600 90 57600
16 10240 41 26240 66 42240 100 64000
17 10880 42 26880 67 42880 125 80000
18 11520 43 27520 68 43520 150 96000
19 12160 44 28160 69 44160 175 112000
20 12800 45 28800 70 44800 200 128000
21 13440 46 29440 71 45440 250 160000
22 14080 47 30080 72 46080 300 192000
23 14720 48 30720 73 46720 500 320000
24 15360 49 31360 74 47360 750 480000
25 16000 50 32000 75 48000 1000 640000

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