Square Miles Conversion

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

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The square mile is a unit used to measure area. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about square miles.

Square Mile Conversion Calculators

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US Customary
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Square Mile Definition and Usage

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.

You might also be interested in our area calculator.

How Much is a Square Mile?

If you're here, then there's a good chance you might be wondering just how much is a square mile? One square mile is equal to 640 acres or 2.589988 square kilometers.

The chart below shows how much a square mile is in other measures of area.

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 4,014,489,599 sq in 2.589988 sq km 2,589,988 sq m 25,899,881,100 sq cm 2,589,988,110,000 sq mm 258.998811 ha 25,900 a
2 sq mi 1,280 ac 6,195,200 sq yd 55,756,800 sq ft 8,028,979,199 sq in 5.179976 sq km 5,179,976 sq m 51,799,762,200 sq cm 5,179,976,220,000 sq mm 517.997622 ha 51,800 a
3 sq mi 1,920 ac 9,292,800 sq yd 83,635,200 sq ft 12,043,468,798 sq in 7.769964 sq km 7,769,964 sq m 77,699,643,300 sq cm 7,769,964,330,000 sq mm 776.996433 ha 77,700 a
4 sq mi 2,560 ac 12,390,400 sq yd 111,513,600 sq ft 16,057,958,398 sq in 10.359952 sq km 10,359,952 sq m 103,599,524,400 sq cm 10,359,952,440,000 sq mm 1,036 ha 103,600 a
5 sq mi 3,200 ac 15,488,000 sq yd 139,392,000 sq ft 20,072,447,997 sq in 12.949941 sq km 12,949,941 sq m 129,499,405,500 sq cm 12,949,940,550,000 sq mm 1,295 ha 129,499 a
6 sq mi 3,840 ac 18,585,600 sq yd 167,270,400 sq ft 24,086,937,597 sq in 15.539929 sq km 15,539,929 sq m 155,399,286,600 sq cm 15,539,928,660,000 sq mm 1,554 ha 155,399 a
7 sq mi 4,480 ac 21,683,200 sq yd 195,148,800 sq ft 28,101,427,196 sq in 18.129917 sq km 18,129,917 sq m 181,299,167,700 sq cm 18,129,916,770,000 sq mm 1,813 ha 181,299 a
8 sq mi 5,120 ac 24,780,800 sq yd 223,027,200 sq ft 32,115,916,796 sq in 20.719905 sq km 20,719,905 sq m 207,199,048,800 sq cm 20,719,904,880,000 sq mm 2,072 ha 207,199 a
9 sq mi 5,760 ac 27,878,400 sq yd 250,905,600 sq ft 36,130,406,395 sq in 23.309893 sq km 23,309,893 sq m 233,098,929,900 sq cm 23,309,892,990,000 sq mm 2,331 ha 233,099 a
10 sq mi 6,400 ac 30,976,000 sq yd 278,784,000 sq ft 40,144,895,995 sq in 25.899881 sq km 25,899,881 sq m 258,998,811,000 sq cm 25,899,881,100,000 sq mm 2,590 ha 258,999 a
11 sq mi 7,040 ac 34,073,600 sq yd 306,662,400 sq ft 44,159,385,594 sq in 28.489869 sq km 28,489,869 sq m 284,898,692,100 sq cm 28,489,869,210,000 sq mm 2,849 ha 284,899 a
12 sq mi 7,680 ac 37,171,200 sq yd 334,540,800 sq ft 48,173,875,194 sq in 31.079857 sq km 31,079,857 sq m 310,798,573,200 sq cm 31,079,857,320,000 sq mm 3,108 ha 310,799 a
13 sq mi 8,320 ac 40,268,800 sq yd 362,419,200 sq ft 52,188,364,793 sq in 33.669845 sq km 33,669,845 sq m 336,698,454,300 sq cm 33,669,845,430,000 sq mm 3,367 ha 336,698 a
14 sq mi 8,960 ac 43,366,400 sq yd 390,297,600 sq ft 56,202,854,393 sq in 36.259834 sq km 36,259,834 sq m 362,598,335,400 sq cm 36,259,833,540,000 sq mm 3,626 ha 362,598 a
15 sq mi 9,600 ac 46,464,000 sq yd 418,176,000 sq ft 60,217,343,992 sq in 38.849822 sq km 38,849,822 sq m 388,498,216,500 sq cm 38,849,821,650,000 sq mm 3,885 ha 388,498 a
16 sq mi 10,240 ac 49,561,600 sq yd 446,054,400 sq ft 64,231,833,592 sq in 41.43981 sq km 41,439,810 sq m 414,398,097,600 sq cm 41,439,809,760,000 sq mm 4,144 ha 414,398 a
17 sq mi 10,880 ac 52,659,200 sq yd 473,932,800 sq ft 68,246,323,191 sq in 44.029798 sq km 44,029,798 sq m 440,297,978,700 sq cm 44,029,797,870,000 sq mm 4,403 ha 440,298 a
18 sq mi 11,520 ac 55,756,800 sq yd 501,811,200 sq ft 72,260,812,791 sq in 46.619786 sq km 46,619,786 sq m 466,197,859,800 sq cm 46,619,785,980,000 sq mm 4,662 ha 466,198 a
19 sq mi 12,160 ac 58,854,400 sq yd 529,689,600 sq ft 76,275,302,390 sq in 49.209774 sq km 49,209,774 sq m 492,097,740,900 sq cm 49,209,774,090,000 sq mm 4,921 ha 492,098 a
20 sq mi 12,800 ac 61,952,000 sq yd 557,568,000 sq ft 80,289,791,990 sq in 51.799762 sq km 51,799,762 sq m 517,997,622,000 sq cm 51,799,762,200,000 sq mm 5,180 ha 517,998 a

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