Square Miles to Hectares Converter

1 square mile is equal to 258.999 hectares, or 2,589,988.11 m².

Enter a value in the converter to get the result. This page explains the formula, works through examples and lists common values in a conversion table.

How to convert square miles to hectares

Multiply the value in square miles by 258.9988 to get hectares.

ha = × 258.9988
  1. 1Start with the value in square miles: 1 mi².
  2. 2Apply the formula: × 258.9988 = 258.998811034.
  3. 3Round to the precision you need: 258.999 ha.

For a quick estimate without a calculator, multiply by 259. For 1 mi² that gives about 259 ha.

Examples

10 mi² to ha × 258.9988
= 2,589.99 ha50 mi² to ha × 258.9988
= 12,949.94 ha250 mi² to ha × 258.9988
= 64,749.7 ha

Square Miles to Hectares conversion table

Square Miles (mi²)Hectares (ha)Square Meters (m²)
1 mi²258.999 ha2,589,988.11 m²
5 mi²1,294.99 ha12,949,940.55 m²
10 mi²2,589.99 ha25,899,881.1 m²
20 mi²5,179.98 ha51,799,762.21 m²
25 mi²6,474.97 ha64,749,702.76 m²
50 mi²12,949.94 ha129,499,405.52 m²
75 mi²19,424.91 ha194,249,108.28 m²
100 mi²25,899.88 ha258,998,811.03 m²
150 mi²38,849.82 ha388,498,216.55 m²
200 mi²51,799.76 ha517,997,622.07 m²
500 mi²129,499.41 ha1,294,994,055.17 m²
1,000 mi²258,998.81 ha2,589,988,110.34 m²

1 square mile in other units

The same value in every other unit of this category. Each row links to the full conversion.

UnitFormula1 mi² equals
Square Miles to Square Millimetersmm² = × 2,589,988,110,3362,589,988,110,336 mm²
Square Miles to Centimeterscm² = × 25,899,881,10325,899,881,103.36 cm²
Square Miles to Square Metersm² = × 2,589,9882,589,988.11 m²
Square Miles to Hectaresha = × 258.9988258.999 ha
Square Miles to Square Kilometerskm² = × 2.5899882.58999 km²
Square Miles to Square Inchesin² = × 4,014,489,6004,014,489,600 in²
Square Miles to Square Yardsyd² = × 3,097,6003,097,600 yd²
Square Miles to Square Feetft² = × 27,878,40027,878,400 ft²
Square Miles to Acresac = × 640640 ac

Hectares to Square Miles

The reverse conversion uses the inverse formula. For example, 1 ha is 0.00386102 mi². Use the hectares to square miles converter for other values.

mi² = ÷ 258.9988
1 ha to mi²5 ha to mi²10 ha to mi²25 ha to mi²50 ha to mi²100 ha to mi²500 ha to mi²1,000 ha to mi²

About the units

Square Mile (mi²)

A unit of area in the imperial and US customary systems. 1 mi² = 258.999 ha.

Hectare (ha)

A unit of area in the metric system. 1 ha = 0.00386102 mi².

Accuracy and rounding

The calculation uses exact decimal arithmetic, so the conversion itself adds no error. Results are rounded to six significant figures; the formula steps show more digits.

More square miles to hectares conversions

2 mi² to ha5 mi² to ha10 mi² to ha20 mi² to ha25 mi² to ha50 mi² to ha75 mi² to ha100 mi² to ha150 mi² to ha200 mi² to ha250 mi² to ha500 mi² to ha1,000 mi² to ha

FAQ

How many hectares are in one square mile?

One square mile is equal to 258.999 hectares.

How do I convert hectares back to square miles?

Use the formula mi² = ÷ 258.9988. See the hectares to square miles converter.