Square Mile Conversion Calculator
Enter a value in square miles below to convert to another unit of area.
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Do you want to convert square miles to square kilometers?
Square Mile Conversion Calculators
You can also convert area using one of our square mile converters below.
US Customary
SI Units
Other Metric Units
What Is a Square Mile?
Joe is the creator of Inch Calculator and has over 20 years of experience in engineering and construction. He holds several degrees and certifications.
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
| 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 |
You might also like our other measurement calculators.
References
- National Institute of Standards & Technology, Unit Conversion, https://www.nist.gov/pml/owm/metric-si/unit-conversion