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Square Miles to Hectares (mi² to ha) Converter

1 square mile (mi²) = 258.999 hectares (ha). To convert square miles to hectares, multiply by 258.999: 25 mi² × 258.999 = 6,474.97 ha.

1 mi² = 258.9988110336 ha
Convert the other way: Hectares to Square Miles

Quick facts

How to convert square miles to hectares

  1. Take the value in square miles.
  2. Multiply it by 258.999 (the number of hectares in one square mile).
  3. Round the result to the precision you need.
ha = mi² × 258.999

Worked example: 25 mi² × 258.999 = 6474.97 ha.

To convert hectares back to square miles, multiply by 0.00386102, or divide by 258.999.

Source: NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ.

Square Miles to Hectares conversion table

Square Miles to Hectares conversion table
Square Miles [mi²]Hectares [ha]
0.01 mi²2.5899881103 ha
0.1 mi²25.8998811034 ha
1 mi²258.9988110336 ha
2 mi²517.9976220672 ha
3 mi²776.9964331008 ha
5 mi²1294.994055168 ha
10 mi²2589.988110336 ha
20 mi²5179.976220672 ha
50 mi²12949.94055168 ha
100 mi²25899.88110336 ha
1000 mi²258998.8110336 ha

mi² to ha chart from 1 to 100

Hectares to Square Miles conversion table

Hectares to Square Miles conversion table
Hectares [ha]Square Miles [mi²]
0.01 ha0.0000386102 mi²
0.1 ha0.0003861022 mi²
1 ha0.0038610216 mi²
2 ha0.0077220432 mi²
3 ha0.0115830648 mi²
5 ha0.0193051079 mi²
10 ha0.0386102159 mi²
20 ha0.0772204317 mi²
50 ha0.1930510793 mi²
100 ha0.3861021585 mi²
1000 ha3.8610215854 mi²

Square Miles vs Hectares

Square MileHectare
Symbolmi²ha
Equals1 mi² = 258.999 ha1 ha = 0.00386102 mi²

What is a square mile?

The area of a square with 1-mile sides. Used in the US and UK for large land areas and population density.

What is a hectare?

Equal to 10,000 square meters, or a 100-by-100 meter square. Used internationally for land and agricultural area.

Frequently asked questions

How many hectares are in a square mile?

There are 258.999 hectares in 1 square mile (1 mi² = 258.9988110336 ha).

How many square miles are in a hectare?

There are 0.00386102 square miles in 1 hectare (1 ha = 0.0038610216 mi²).

How do I convert square miles to hectares?

Multiply the number of square miles by 258.999. For example, 10 mi² × 258.999 = 2,589.99 ha. To convert back, multiply by 0.00386102.

What is 10 mi² in hectares?

10 mi² = 2,589.99 ha.

What is 100 mi² in hectares?

100 mi² = 25,899.9 ha.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008). Marla and kanal use the Punjab standard stated in their definitions; local sizes can differ). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026