Square Miles Conversion

Calculators can be used to convert measurements from one unit to another

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

Choose a unit of area to convert to.

US Customary

Convert square miles to acres: 1 square mile is equal to 640 acres
Convert square miles to square yards: 1 square mile is equal to 3,097,600 square yards
Convert square miles to square feet: 1 square mile is equal to 27,878,400 square feet
Convert square miles to square inches: 1 square mile is equal to 4,014,489,599 square inches

SI Units

Convert square miles to square kilometers: 1 square mile is equal to 2.589988 square kilometers
Convert square miles to square meters: 1 square mile is equal to 2,589,988 square meters
Convert square miles to square centimeters: 1 square mile is equal to 25,899,881,100 square centimeters
Convert square miles to square millimeters: 1 square mile is equal to 2,589,988,110,000 square millimeters

Other Metric Units

Convert square miles to hectares: 1 square mile is equal to 258.998811 hectares
Convert square miles to ares: 1 square mile is equal to 25,900 ares

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.

Square Miles Measurement 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	4,014,489,599 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