Convert Square Miles to Hectares

Enter your square mile value in the form below to get the value calculated in hectares.

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Results in Hectares:
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1 sq mi = 258.998811 ha

How to Convert Square Miles to Hectares

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

Convert square miles to hectares with this simple formula:

hectares = square miles × 258.998811

Converting a square mile area measurement to a hectare measurement involves multiplying the area by the conversion ratio to find the result. One square mile is equal to 258.998811 hectares, so to convert simply multiply 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

Learn more about finding the area of your space using our area calculator.

Square miles and hectares are both units used to measure area. Learn more about area and find more area measurement conversion calculators. Square miles are an imperial measurement and can be abbreviated as sq mi, for example 1 sq mi. Hectares are a metric measurement and can be abbreviated as ha, for example 1 ha. Learn more about the metric system, including the common unit prefixes and how to convert between metric units.

square miles and hectares are units used to measure area
Convert Hectares to Square Miles

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
Are Units
Convert to Ares
1 sq mi is equal to 25,899.9 ares