Square Mile to Hectare Converter
Convert Square Mile (mi²) to Hectare (ha) instantly. 1 mi² = 258.998811 ha.
Area Converter
20 units available
1 mi² = 258.998811 ha
Formula:
ha = mi² × 258.9988110336With your value: 1 mi² = 258.99881103 ha
How big is that?
Everyday references on a logarithmic scale, all expressed in square mile so you can sanity-check the result.
Other Square Mile to Hectare conversions
Square Mile to Hectare Conversion Table
| Square Mile (mi²) | Hectare (ha) |
|---|---|
| 0.5 | 129.499406 |
| 1 | 258.998811 |
| 2 | 517.997622 |
| 5 | 1,294.994055 |
| 10 | 2,589.98811 |
| 15 | 3,884.982166 |
| 20 | 5,179.976221 |
| 25 | 6,474.970276 |
| 50 | 12,949.940552 |
| 100 | 25,899.881103 |
| 250 | 64,749.702758 |
| 500 | 129,499.405517 |
| 1000 | 258,998.811034 |
Hectare to Square Mile Conversion Table
| Hectare (ha) | Square Mile (mi²) |
|---|---|
| 0.5 | 0.001931 |
| 1 | 0.003861 |
| 2 | 0.007722 |
| 5 | 0.019305 |
| 10 | 0.03861 |
| 15 | 0.057915 |
| 20 | 0.07722 |
| 25 | 0.096526 |
| 50 | 0.193051 |
| 100 | 0.386102 |
| 250 | 0.965255 |
| 500 | 1.930511 |
| 1000 | 3.861022 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Square Mile (mi²)
Area
Derived from the square metre via the length definitions above.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Hectare (ha)
Area
Derived from the square metre via the length definitions above.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert Square Mile to Hectare
To convert from Square Mile (mi²) to Hectare (ha), multiply the value by 258.9988110336.
Formula: ha = mi² × 258.9988110336
Reverse: mi² = ha × 0.0038610216
Step-by-Step Example
- Start with your value in Square Mile. For example: 5 mi²
- Multiply by the conversion factor: 5 x 258.9988110336
- The result is: 1,294.994055 ha
About Square Mile
The square mile equals 640 acres or about 2.59 square kilometres, and is the standard unit for US county, city and land-survey areas.
Common uses: census areas, land surveys, geography.
About Hectare
The hectare equals 10,000 square meters or about 2.471 acres. It is the primary unit for land measurement in most countries.
Common uses: agriculture, forestry, land planning.
Frequently Asked Questions
How many Hectare are in 1 Square Mile?
There are exactly 258.9988110336 Hectare in 1 Square Mile. This means the conversion factor from Square Mile to Hectare is 258.9988110336.
What is the formula to convert Square Mile to Hectare?
The formula to convert Square Mile to Hectare is: ha = mi² × 258.9988110336. For example, to convert 10 Square Mile to Hectare, you would multiply 10 by 258.9988110336.
What is a Square Mile?
The square mile equals 640 acres or about 2.59 square kilometres, and is the standard unit for US county, city and land-survey areas.
What is a Hectare?
The hectare equals 10,000 square meters or about 2.471 acres. It is the primary unit for land measurement in most countries.
What are the common uses of Square Mile?
The Square Mile is commonly used in census areas, land surveys, geography.
Related Area Conversions
Cite this page
UnitConvertLab. (2026). Square Mile to Hectare converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/sqmile-to-hectare