Square Miles to Square Kilometers Conversion

Enter the area in square miles below to get the value converted to square kilometers.

Results in Square Kilometers:
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1 sq mi = 2.589988 sq km

How to Convert Square Miles to Square Kilometers

To convert a square mile measurement to a square kilometer measurement, multiply the area by the conversion ratio.

Since one square mile is equal to 2.589988 square kilometers, you can use this simple formula to convert:

square kilometers = square miles × 2.589988

The area in square kilometers is equal to the square miles multiplied by 2.589988.

For example, here's how to convert 5 square miles to square kilometers using the formula above.
5 sq mi = (5 × 2.589988) = 12.949941 sq km
conversion scale showing square miles and equivalent square kilometers area values

Square miles and square kilometers are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Miles

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.

Square Kilometers

One square kilometer is equal to the area of a square with sides that are 1 kilometer in length.

The square kilometer, or square kilometre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "kilo" is the prefix for 103. A square kilometer is sometimes also referred to as a square km. Square kilometers can be abbreviated as sq km, and are also sometimes abbreviated as km². For example, 1 square kilometer can be written as 1 sq km or 1 km².

Square Mile to Square Kilometer Conversion Table

Square mile measurements converted to square kilometers
Square Miles Square Kilometers
1 sq mi 2.59 sq km
2 sq mi 5.18 sq km
3 sq mi 7.77 sq km
4 sq mi 10.36 sq km
5 sq mi 12.95 sq km
6 sq mi 15.54 sq km
7 sq mi 18.13 sq km
8 sq mi 20.72 sq km
9 sq mi 23.31 sq km
10 sq mi 25.9 sq km
11 sq mi 28.49 sq km
12 sq mi 31.08 sq km
13 sq mi 33.67 sq km
14 sq mi 36.26 sq km
15 sq mi 38.85 sq km
16 sq mi 41.44 sq km
17 sq mi 44.03 sq km
18 sq mi 46.62 sq km
19 sq mi 49.21 sq km
20 sq mi 51.8 sq km
21 sq mi 54.39 sq km
22 sq mi 56.98 sq km
23 sq mi 59.57 sq km
24 sq mi 62.16 sq km
25 sq mi 64.75 sq km
26 sq mi 67.34 sq km
27 sq mi 69.93 sq km
28 sq mi 72.52 sq km
29 sq mi 75.11 sq km
30 sq mi 77.7 sq km
31 sq mi 80.29 sq km
32 sq mi 82.88 sq km
33 sq mi 85.47 sq km
34 sq mi 88.06 sq km
35 sq mi 90.65 sq km
36 sq mi 93.24 sq km
37 sq mi 95.83 sq km
38 sq mi 98.42 sq km
39 sq mi 101.01 sq km
40 sq mi 103.6 sq km

More Square Mile & Square Kilometer Conversions