Square Mile (sq mi) Conversion Calculator

Square Mile Conversion Calculator

Enter a value in square miles below to convert to another unit of area.

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What Is a Square Mile?

A square mile is a unit used to measure area.

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.

You can find the area of a space in square miles using an area calculator or acreage calculator.

How Much Is a Square Mile?

One square mile is equal to the area of a square with sides that are each 1 mile long. One square mile is roughly equal to 2.59 square kilometers or 640 acres.

How to Convert Square Miles

To convert square miles to another unit of area, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.^[1]

You can find the conversion factors for square miles in the conversion table below.

Then, multiply the area measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

square miles × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

Square Mile Conversion Table

Common square mile values and equivalent imperial and metric area measurements
square miles	acres	square yards	square feet	square inches	square kilometers	square meters	square centimeters	square millimeters	hectares	ares
1 sq mi	640 ac	3,097,600 sq yd	27,878,400 sq ft	4,014,489,600 sq in	2.589988 sq km	2,589,988 sq m	25,899,881,103 sq cm	2,589,988,110,336 sq mm	258.998811 ha	25,900 a
2 sq mi	1,280 ac	6,195,200 sq yd	55,756,800 sq ft	8,028,979,200 sq in	5.179976 sq km	5,179,976 sq m	51,799,762,207 sq cm	5,179,976,220,672 sq mm	517.997622 ha	51,800 a
3 sq mi	1,920 ac	9,292,800 sq yd	83,635,200 sq ft	12,043,468,800 sq in	7.769964 sq km	7,769,964 sq m	77,699,643,310 sq cm	7,769,964,331,008 sq mm	776.996433 ha	77,700 a
4 sq mi	2,560 ac	12,390,400 sq yd	111,513,600 sq ft	16,057,958,400 sq in	10.359952 sq km	10,359,952 sq m	103,599,524,413 sq cm	10,359,952,441,344 sq mm	1,036 ha	103,600 a
5 sq mi	3,200 ac	15,488,000 sq yd	139,392,000 sq ft	20,072,448,000 sq in	12.949941 sq km	12,949,941 sq m	129,499,405,517 sq cm	12,949,940,551,680 sq mm	1,295 ha	129,499 a
6 sq mi	3,840 ac	18,585,600 sq yd	167,270,400 sq ft	24,086,937,600 sq in	15.539929 sq km	15,539,929 sq m	155,399,286,620 sq cm	15,539,928,662,016 sq mm	1,554 ha	155,399 a
7 sq mi	4,480 ac	21,683,200 sq yd	195,148,800 sq ft	28,101,427,200 sq in	18.129917 sq km	18,129,917 sq m	181,299,167,724 sq cm	18,129,916,772,352 sq mm	1,813 ha	181,299 a
8 sq mi	5,120 ac	24,780,800 sq yd	223,027,200 sq ft	32,115,916,800 sq in	20.719905 sq km	20,719,905 sq m	207,199,048,827 sq cm	20,719,904,882,688 sq mm	2,072 ha	207,199 a
9 sq mi	5,760 ac	27,878,400 sq yd	250,905,600 sq ft	36,130,406,400 sq in	23.309893 sq km	23,309,893 sq m	233,098,929,930 sq cm	23,309,892,993,024 sq mm	2,331 ha	233,099 a
10 sq mi	6,400 ac	30,976,000 sq yd	278,784,000 sq ft	40,144,896,000 sq in	25.899881 sq km	25,899,881 sq m	258,998,811,034 sq cm	25,899,881,103,360 sq mm	2,590 ha	258,999 a
11 sq mi	7,040 ac	34,073,600 sq yd	306,662,400 sq ft	44,159,385,600 sq in	28.489869 sq km	28,489,869 sq m	284,898,692,137 sq cm	28,489,869,213,696 sq mm	2,849 ha	284,899 a
12 sq mi	7,680 ac	37,171,200 sq yd	334,540,800 sq ft	48,173,875,200 sq in	31.079857 sq km	31,079,857 sq m	310,798,573,240 sq cm	31,079,857,324,032 sq mm	3,108 ha	310,799 a
13 sq mi	8,320 ac	40,268,800 sq yd	362,419,200 sq ft	52,188,364,800 sq in	33.669845 sq km	33,669,845 sq m	336,698,454,344 sq cm	33,669,845,434,368 sq mm	3,367 ha	336,698 a
14 sq mi	8,960 ac	43,366,400 sq yd	390,297,600 sq ft	56,202,854,400 sq in	36.259834 sq km	36,259,834 sq m	362,598,335,447 sq cm	36,259,833,544,704 sq mm	3,626 ha	362,598 a
15 sq mi	9,600 ac	46,464,000 sq yd	418,176,000 sq ft	60,217,344,000 sq in	38.849822 sq km	38,849,822 sq m	388,498,216,550 sq cm	38,849,821,655,040 sq mm	3,885 ha	388,498 a
16 sq mi	10,240 ac	49,561,600 sq yd	446,054,400 sq ft	64,231,833,600 sq in	41.43981 sq km	41,439,810 sq m	414,398,097,654 sq cm	41,439,809,765,376 sq mm	4,144 ha	414,398 a
17 sq mi	10,880 ac	52,659,200 sq yd	473,932,800 sq ft	68,246,323,200 sq in	44.029798 sq km	44,029,798 sq m	440,297,978,757 sq cm	44,029,797,875,712 sq mm	4,403 ha	440,298 a
18 sq mi	11,520 ac	55,756,800 sq yd	501,811,200 sq ft	72,260,812,800 sq in	46.619786 sq km	46,619,786 sq m	466,197,859,860 sq cm	46,619,785,986,048 sq mm	4,662 ha	466,198 a
19 sq mi	12,160 ac	58,854,400 sq yd	529,689,600 sq ft	76,275,302,400 sq in	49.209774 sq km	49,209,774 sq m	492,097,740,964 sq cm	49,209,774,096,384 sq mm	4,921 ha	492,098 a
20 sq mi	12,800 ac	61,952,000 sq yd	557,568,000 sq ft	80,289,792,000 sq in	51.799762 sq km	51,799,762 sq m	517,997,622,067 sq cm	51,799,762,206,720 sq mm	5,180 ha	517,998 a