Convert Square Miles to Hectares

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

Results in Hectares:
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1 sq mi = 258.998811 ha

How to Convert Square Miles to Hectares

conversion scale showing square miles and equivalent hectares area values

To convert a square mile measurement to a hectare measurement, multiply the area by the conversion ratio. One square mile is equal to 258.998811 hectares, so use this simple formula to convert:

hectares = square miles × 258.998811

The area in hectares is equal to the square miles multiplied by 258.998811.

For example, here's how to convert 5 square miles to hectares using the formula above.
5 sq mi = (5 × 258.998811) = 1,294.994055 ha

Square miles and hectares 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.


One hectare is equal to 10,000 square meters, or the area of a square with 100 meter sides.

The hectare is an SI accepted unit for area for use with the metric system. In the metric system, "hecto" is the prefix for 102. Hectares can be abbreviated as ha, for example 1 hectare can be written as 1 ha.

Square Mile Measurements and Equivalent Hectare Conversions

Common square mile values converted to the equivalent hectare value
Square Miles Hectares
1 sq mi 259 ha
2 sq mi 518 ha
3 sq mi 777 ha
4 sq mi 1,036 ha
5 sq mi 1,295 ha
6 sq mi 1,554 ha
7 sq mi 1,813 ha
8 sq mi 2,072 ha
9 sq mi 2,331 ha
10 sq mi 2,590 ha
11 sq mi 2,849 ha
12 sq mi 3,108 ha
13 sq mi 3,367 ha
14 sq mi 3,626 ha
15 sq mi 3,885 ha
16 sq mi 4,144 ha
17 sq mi 4,403 ha
18 sq mi 4,662 ha
19 sq mi 4,921 ha
20 sq mi 5,180 ha
21 sq mi 5,439 ha
22 sq mi 5,698 ha
23 sq mi 5,957 ha
24 sq mi 6,216 ha
25 sq mi 6,475 ha
26 sq mi 6,734 ha
27 sq mi 6,993 ha
28 sq mi 7,252 ha
29 sq mi 7,511 ha
30 sq mi 7,770 ha
31 sq mi 8,029 ha
32 sq mi 8,288 ha
33 sq mi 8,547 ha
34 sq mi 8,806 ha
35 sq mi 9,065 ha
36 sq mi 9,324 ha
37 sq mi 9,583 ha
38 sq mi 9,842 ha
39 sq mi 10,101 ha
40 sq mi 10,360 ha

More Square Mile Area Conversions

US Customary
Convert to Acres
1 sq mi is equal to 640 acres
Convert to Square Yards
1 sq mi is equal to 3,097,600 square yards
Convert to Square Feet
1 sq mi is equal to 27,878,400 square feet
Convert to Square Inches
1 sq mi is equal to 4,014,489,599.5 square inches
SI Units
Convert to Square Kilometers
1 sq mi is equal to 2.589988 square kilometers
Convert to Square Meters
1 sq mi is equal to 2,589,988.1 square meters
Convert to Square Centimeters
1 sq mi is equal to 25,899,881,100 square centimeters
Convert to Square Millimeters
1 sq mi is equal to 2,589,988,110,000 square millimeters
Other Metric Units
Convert to Ares
1 sq mi is equal to 25,899.9 ares