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Conversion

Square Miles to Hectares Converter

1 square mile = 258.998811 ha. Enter any value to convert square miles (mi²) to hectares (ha), or use the table below for common values.

Results

1 mi² =258.998811 hasquare miles → hectares
1 mi²258.998811 ha
1 ha0.003861021585 mi²
Formula
ha = mi² × 258.998811
1 mi² in other units
UnitValue
square meters (m²)2,589,988.11
square kilometers (km²)2.58998811
square inches (in²)4,014,489,600
square feet (ft²)27,878,400
square yards (yd²)3,097,600
acres (ac)640
hectares (ha)258.998811

Formula

ha = mi² × 258.998811

Example: 10 mi² = 2,589.98811 ha. To convert the other way, use mi² = ha × 0.003861021585.

Quick mental estimate: multiply by about 260.

Square Miles to Hectares conversion table

Square Miles (mi²)Hectares (ha)
1 mi²258.998811 ha
2 mi²517.9976221 ha
3 mi²776.9964331 ha
4 mi²1,035.995244 ha
5 mi²1,294.994055 ha
6 mi²1,553.992866 ha
7 mi²1,812.991677 ha
8 mi²2,071.990488 ha
9 mi²2,330.989299 ha
10 mi²2,589.98811 ha
15 mi²3,884.982166 ha
20 mi²5,179.976221 ha
25 mi²6,474.970276 ha
30 mi²7,769.964331 ha
40 mi²10,359.95244 ha
50 mi²12,949.94055 ha
75 mi²19,424.91083 ha
100 mi²25,899.8811 ha
250 mi²64,749.70276 ha
500 mi²129,499.4055 ha
1,000 mi²258,998.811 ha

About square miles and hectares

The square mile is 640 acres, used for large land areas such as counties and national parks in the US.

The hectare is 10,000 m² (100 m × 100 m), the standard unit for farmland and forests in metric countries.

Other Area conversions

Hectares → Square MilesReverse conversionSquare Meters → Hectaresm² → haSquare Kilometers → Hectareskm² → haSquare Inches → Hectaresin² → haSquare Feet → Hectaresft² → haSquare Yards → Hectaresyd² → haSquare Miles → Square Metersmi² → m²Square Miles → Square Kilometersmi² → km²Square Miles → Square Inchesmi² → in²Square Miles → Square Feetmi² → ft²Square Miles → Square Yardsmi² → yd²Square Miles → Acresmi² → acAcres → Hectaresac → ha

Frequently asked questions

How do I convert square miles to hectares?

Use the formula ha = mi² × 258.998811. For example, 10 mi² = 2,589.98811 ha.

What is 1 square mile in hectares?

1 mi² = 258.998811 ha.

How do I convert hectares back to square miles?

Use mi² = ha × 0.003861021585. 1 ha = 0.003861021585 mi².